Problem p02588 (C++) — buggy submission, verdict: Runtime Error

#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <map>
#include <queue>
#define cl_has_dh(x...)                                                        \\
  cl_get_th_100(x, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
#define cl_get_th_100(                                                         \\
    _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, \\
    _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, \\
    _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, _44, _45, _46, \\
    _47, _48, _49, _50, _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, _61, \\
    _62, _63, _64, _65, _66, _67, _68, _69, _70, _71, _72, _73, _74, _75, _76, \\
    _77, _78, _79, _80, _81, _82, _83, _84, _85, _86, _87, _88, _89, _90, _91, \\
    _92, _93, _94, _95, _96, _97, _98, _99, _100, x...)                        \\
  _100
#if 0
#define cl_blzk cl_blzk0
#else
#define cl_blzk cl_blzk3
#endif
#define cl_blzk0(x...) cl_blzk1(cl_blzk1(cl_blzk1(x)))
#define cl_blzk1(x...) cl_blzk2(cl_blzk2(cl_blzk2(x)))
#define cl_blzk2(x...) cl_blzk3(cl_blzk3(cl_blzk3(x)))
#define cl_blzk3(x...) cl_blzk4(cl_blzk4(cl_blzk4(x)))
#define cl_blzk4(x...) cl_blzk5(cl_blzk5(cl_blzk5(x)))
#define cl_blzk5(x...) cl_blzk6(cl_blzk6(cl_blzk6(x)))
#define cl_blzk6(x...) cl_blzk7(cl_blzk7(cl_blzk7(x)))
#define cl_blzk7(x...) x
#define cl_lj_(a, b) a##b
#define cl_lj(a, b) cl_lj_(a, b)
#define cl_not(x) cl_lj(cl_not_, x)
#define cl_not_0 1
#define cl_not_1 0
#define cl_and(x, y) cl_lj(cl_and_, cl_lj(x, y))
#define cl_and_00 0
#define cl_and_01 0
#define cl_and_10 0
#define cl_and_11 1
#define cl_bif(x) cl_lj(cl_bif_, x)
#define cl_bif_0(x...) cl_bif_0_
#define cl_bif_0_(x...) x
#define cl_bif_1(x...) x cl_bif_1_
#define cl_bif_1_(x...)
#define cl_nn(x...)
#define cl_zzk(x...) x
#define cl_zkk(x...) x
#define cl_after(x...) cl_zzk cl_nn()(x)
#define cl_tafter(x...) x
#define cl_txt(x...) #x
#define cl_show(x...) puts(cl_txt(x))
#define cl_is_nn(x...) cl_is_nnmm(x)
#define cl_x_to_dh(x...) ,
#define cl_is_nnmm(x...)                                                       \\
  cl_and(cl_and(cl_not(cl_has_dh(cl_x_to_dh x)), cl_has_dh(cl_x_to_dh x())),   \\
         cl_not(cl_has_dh(x())))
typedef long long ll;
typedef long double ld;
#define gs1(x, y, z)                                                           \\
  (quick_IO::very_important_cs_scw = y, quick_IO::very_important_cs_xsd = z, x)
#define gs0(x, y) (quick_IO::very_important_cs_scw = y, x)
#define gs(x, y...) cl_lj(gs, cl_has_dh(y))(x, y)
#define read_cz(cs, _1, _01)                                                   \\
  cl_bif(_01)((+)quick_IO::whreadm(_1) cl_zkk)(() cl_nn)
#define write_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)((, )quick_IO::whwritem(_1) cl_zkk)(() cl_nn)
#define read(x...) cl_blzk(cl_nn cl_d(read_cz, , x)())
#define write(x...) cl_blzk(cl_nn cl_d(write_cz, , x)())
#define cl_pp(cs, x...) cl_blzk(cl_d(cl_pp_cz, cs, x))
#define cl_pp_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)(template <> struct cs<_1> { typedef _1 Type; };)()
#define cl_d(cz, cs, x...) cl_ds(cz, cs, x)
#define cl_ds(cz, cs, x...) cl_lj(cl_ds_, cl_is_nn(x))(cz, cs, x)
#define cl_ds_1(cz, cs, _1, x...) cz(cs, _1, 0)
#define cl_ds_0(cz, cs, _1, x...) cz(cs, _1, 1) cl_after(cl_ds_cpy)()(cz, cs, x)
#define cl_ds_cpy() cl_ds
#define isdigit(x) (x >= '0' && x <= '9')
#define pp(a, b)                                                               \\
  template <> struct a<b> {                                                    \\
    typedef b Type;                                                            \\
  };
namespace quick_IO {
inline bool blank(char ch) {
  return ch == ' ' || ch == '\\n' || ch == '\\r' || ch == '\\t';
}
ll very_important_cs_scw = 0, very_important_cs_xsd = 6, cs = 0;
inline char gc() { return getchar(); }
inline void pc(char c) { cs ? fprintf(stderr, "%c", c) : putchar(c); }
template <typename T> struct Checker1;
cl_pp(Checker1, int, short, long, long long, unsigned int, unsigned long,
      unsigned long long, double, long double, float) template <typename T>
struct Checker2;
cl_pp(Checker2, char) char lastc = -2;
template <typename T> inline ll readm(typename Checker1<T>::Type &x) {
  register double tmp = 1;
  register bool sign = 0;
  x = 0;
  register char ch = lastc == -2 ? gc() : lastc;
  for (; !isdigit(ch); ch = gc())
    if (ch == '-')
      sign = 1;
    else if (ch == EOF)
      return 0;
  for (; isdigit(ch); ch = gc())
    x = x * 10 + (ch - '0');
  if (ch == '.')
    for (ch = gc(); isdigit(ch); ch = gc())
      tmp /= 10.0, x += tmp * (ch - '0');
  if (sign)
    x = -x;
  lastc = ch;
  return 1;
}
template <typename T> inline ll readm(typename Checker2<T>::Type &c) {
  for (c = lastc == -2 ? gc() : lastc; blank(c); c = gc())
    ;
  if (c == EOF)
    return 0;
  lastc = -2;
  return 1;
}
inline ll readm(char *s) {
  register char ch = lastc == -2 ? gc() : lastc;
  for (; blank(ch); ch = gc())
    if (ch == EOF)
      return 0;
  for (; ch != -1 && !blank(ch); ch = gc())
    *s++ = ch;
  *s = 0;
  lastc = ch;
}
void writellm(ll c, ll x) {
  if (c < 0)
    pc('-'), c = -c, x--;
  if (c < 10)
    return ({
      for (ll i = 1; i <= x - 1; i++)
        pc(' ');
      pc(c ^ 48);
      void(0);
    });
  writellm(c / 10, x - 1);
  pc((c % 10) ^ 48);
}
template <typename T> ll whreadm(T *x) { return readm(x); };
template <typename T> ll whreadm(T &x) { return readm<T>(x); };
#define x very_important_cs_xsd
#define y very_important_cs_scw
template <typename T> void writem(typename Checker2<T>::Type c) {
  for (ll i = 1; i <= y - 1; i++)
    pc(' ');
  pc(c);
}
template <typename T> struct Checkers1;
cl_pp(Checkers1, int, short, long, long long, unsigned int, unsigned long,
      unsigned long long) template <typename T>
inline void ycl(typename Checkers1<T>::Type c) {
  x = 0;
}
template <typename T> void ycl(T c) {}
template <typename T> void writem(typename Checker1<T>::Type c) {
  if (c < 0)
    putchar('-'), c = -c;
  ycl<T>(c);
  long double ys = 0.5;
  for (ll i = 1; i <= x; i++)
    ys /= 10;
  c += ys;
  writellm(ll(c), y - (x ? x + 1 : 0));
  c -= ll(c);
  if (!x)
    return;
  pc('.');
  for (ll i = 1; i <= x; i++)
    c *= 10, pc(char(c) ^ 48), c -= char(c);
}
void writem(const char *c) {
  ll len = std::strlen(c);
  for (ll i = 1; i <= y - len; i++)
    pc(' ');
  while (*c)
    pc(*c++);
}
#undef x
#undef y
template <typename T> void whwritem(T *x) {
  writem(x);
  very_important_cs_scw = 0, very_important_cs_xsd = 6;
};
template <typename T> void whwritem(T x) {
  writem<T>(x);
  very_important_cs_scw = 0, very_important_cs_xsd = 6;
};
} // namespace quick_IO
#define IO_debug 0
#define IO(x)                                                                  \\
  freopen(#x ".in", "r", stdin)                                                \\
      cl_bif(IO_debug)()(; freopen(#x ".out", "w", stdout))
#define bla , (((zjhyyds))),
#define cl_del_3_kh(x...) cl_bif(cl_has_3_kh(x))(cl_del_2_kh x)(x)
#define cl_del_2_kh(x...) cl_bif(cl_has_2_kh(x))(cl_del_1_kh x)(x)
#define cl_del_1_kh(x...) cl_bif(cl_has_1_kh(x))(cl_zkk x)(x)
#define cl_has_3_kh(x...) cl_bif(cl_has_1_kh(x))(cl_has_2_kh x)(0)
#define cl_has_2_kh(x...) cl_bif(cl_has_1_kh(x))(cl_has_1_kh x)(0)
#define cl_has_1_kh(x...) cl_is_nn(cl_nn x)
#define is_zjhyyds(x) cl_bif(cl_has_3_kh(x))(cl_is_nn(is_zjhyyds_(x)))(0)
#define is_zjhyyds_(x) cl_lj(is_zjhyyds_s, cl_del_3_kh(x))
#define is_zjhyyds_szjhyyds
#define cl_rir_dh(cs, x...) cl_zzk(cl_nn cl_rir(cs, (, )x cl_zzk)())
#define cl_rir(cs, x...) cl_blzk(cl_d(cl_rir_cz, (x), cl_zkk cs))
#define cl_rir_cz(cs, _1, _01)                                                 \\
  cl_bif(_01)(cl_after(cl_hg_cpy)()(_1, cl_zkk cs))()
#define cl_hg_cpy() cl_hg
#define cl_hg(cs, x...) cl_nn cl_after(cl_ds_cpy)()(cl_hg_cz, cs, x)()
#define cl_hg_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)(cl_bif(is_zjhyyds(_1))(() cs cl_nn)((, )_1 cl_zkk))(() cl_nn)
ll readll(void) {
  ll x = 0, w = 1;
  char c = getchar();
  for (; c < '0' || c > '9'; (c - '-') || (w = -w), c = getchar())
    ;
  for (; c >= '0' && c <= '9';
       x = (x << 1) + (x << 3) + (c ^ 48), c = getchar())
    ;
  return x * w;
}
#define cl_rill(x...) cl_blzk(cl_nn cl_d(cl_rill_cz, , x)())
#define rill(x...) cl_rill(x)
#define cl_rill_cz(cs, _1, _01) cl_bif(_01)((, )_1 = readll() cl_zkk)(() cl_nn)
#define writeln(x...) cl_bif(cl_is_nn(x))(write('\\n'))(write(x, '\\n'))
#define rep(cs, low, up, x...)                                                 \\
  rfor(ll cs = low; cs <= up; cl_bif(cl_is_nn(x))(cs++)(x))
#define frh(cs, cz, low, up, x...)                                             \\
  rfor(ll cs, cl_lj(WCR_yyds_, cs) = low;                                      \\
       cs = cz[cl_lj(WCR_yyds_, cs)], cl_lj(WCR_yyds_, cs) <= up;              \\
       cl_lj(WCR_yyds_, cs)++) cl_bif(cl_is_nn(x))()(if (x))
#define per(cs, low, up, x...)                                                 \\
  rfor(ll cs = low; cs >= up; cl_bif(cl_is_nn(x))(cs--)(x))
#define cl_hsdd(hs, x...) cl_blzk(cl_bif(cl_is_nn(x))()(cl_hsdd_(hs, x)))
#define cl_hsdd_(hs, _1, x...) cl_lj(cl_hsdd_, cl_is_nn(x))(hs, _1, x)
#define cl_hsdd_1(hs, _1, x...) _1
#define cl_hsdd_0(hs, _1, x...) hs(_1, cl_after(cl_hsdd_cpy)()(hs, x))
#define cl_hsdd_cpy() cl_hsdd_
#define mx(x...) cl_hsdd(std::max, x)
#define mn(x...) cl_hsdd(std::min, x)
#define rfor(x...) for (x)
#define debug(x...) quick_IO::cs = 1, write(x), quick_IO::cs = 0
#define debugln(x...) quick_IO::cs = 1, writeln(x), quick_IO::cs = 0
ll af25[23][23], acnt2[2222222], acnt5[2222222];
int main() {
  // IO(A);
  // x/1000000000=y/(2^a*5^b)
  //	ll rill(n);
  ll n;
  scanf("%lld", &n);
  rep(i, 1, n) {
    double x;
    scanf("%lf", &x);
    //		read(x);
    x *= 1000000000;
    ll y = (ll)(x + 0.3);
    //	writeln(y);
    ll cnt2 = 0, cnt5 = 0;
    if (y == 0) {
      cnt2 = 18, cnt5 = 18;
    } else {
      while (cnt2 <= 17 && !(y % 2))
        y /= 2, cnt2++;
      while (cnt5 <= 17 && !(y % 5))
        y /= 5, cnt5++;
    }
    acnt2[i] = mn(18ll, cnt2), acnt5[i] = mn(18ll, cnt5);
    af25[cnt2][cnt5]++;
  }
  //	return 0;
  per(i, 18, 0) per(j, 18, 0) af25[i][j] +=
      af25[i + 1][j] + af25[i][j + 1] - af25[i + 1][j + 1];
  ll ans = 0;
  rep(i, 1, n) {
    ans += af25[18 - acnt2[i]][18 - acnt5[i]];
    //		printf("%lld\\n",ans);
    //	writeln(ans);
    if (acnt2[i] >= 9 && acnt5[i] >= 9)
      ans--;
  }
  printf("%lld\\n", ans / 2);
  return 0;
}

Error: 0

Fixed submission:

#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <map>
#include <queue>
#define cl_has_dh(x...)                                                        \\
  cl_get_th_100(x, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \\
                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0)
#define cl_get_th_100(                                                         \\
    _0, _1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16, \\
    _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, _29, _30, _31, \\
    _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, _44, _45, _46, \\
    _47, _48, _49, _50, _51, _52, _53, _54, _55, _56, _57, _58, _59, _60, _61, \\
    _62, _63, _64, _65, _66, _67, _68, _69, _70, _71, _72, _73, _74, _75, _76, \\
    _77, _78, _79, _80, _81, _82, _83, _84, _85, _86, _87, _88, _89, _90, _91, \\
    _92, _93, _94, _95, _96, _97, _98, _99, _100, x...)                        \\
  _100
#if 0
#define cl_blzk cl_blzk0
#else
#define cl_blzk cl_blzk3
#endif
#define cl_blzk0(x...) cl_blzk1(cl_blzk1(cl_blzk1(x)))
#define cl_blzk1(x...) cl_blzk2(cl_blzk2(cl_blzk2(x)))
#define cl_blzk2(x...) cl_blzk3(cl_blzk3(cl_blzk3(x)))
#define cl_blzk3(x...) cl_blzk4(cl_blzk4(cl_blzk4(x)))
#define cl_blzk4(x...) cl_blzk5(cl_blzk5(cl_blzk5(x)))
#define cl_blzk5(x...) cl_blzk6(cl_blzk6(cl_blzk6(x)))
#define cl_blzk6(x...) cl_blzk7(cl_blzk7(cl_blzk7(x)))
#define cl_blzk7(x...) x
#define cl_lj_(a, b) a##b
#define cl_lj(a, b) cl_lj_(a, b)
#define cl_not(x) cl_lj(cl_not_, x)
#define cl_not_0 1
#define cl_not_1 0
#define cl_and(x, y) cl_lj(cl_and_, cl_lj(x, y))
#define cl_and_00 0
#define cl_and_01 0
#define cl_and_10 0
#define cl_and_11 1
#define cl_bif(x) cl_lj(cl_bif_, x)
#define cl_bif_0(x...) cl_bif_0_
#define cl_bif_0_(x...) x
#define cl_bif_1(x...) x cl_bif_1_
#define cl_bif_1_(x...)
#define cl_nn(x...)
#define cl_zzk(x...) x
#define cl_zkk(x...) x
#define cl_after(x...) cl_zzk cl_nn()(x)
#define cl_tafter(x...) x
#define cl_txt(x...) #x
#define cl_show(x...) puts(cl_txt(x))
#define cl_is_nn(x...) cl_is_nnmm(x)
#define cl_x_to_dh(x...) ,
#define cl_is_nnmm(x...)                                                       \\
  cl_and(cl_and(cl_not(cl_has_dh(cl_x_to_dh x)), cl_has_dh(cl_x_to_dh x())),   \\
         cl_not(cl_has_dh(x())))
typedef long long ll;
typedef long double ld;
#define gs1(x, y, z)                                                           \\
  (quick_IO::very_important_cs_scw = y, quick_IO::very_important_cs_xsd = z, x)
#define gs0(x, y) (quick_IO::very_important_cs_scw = y, x)
#define gs(x, y...) cl_lj(gs, cl_has_dh(y))(x, y)
#define read_cz(cs, _1, _01)                                                   \\
  cl_bif(_01)((+)quick_IO::whreadm(_1) cl_zkk)(() cl_nn)
#define write_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)((, )quick_IO::whwritem(_1) cl_zkk)(() cl_nn)
#define read(x...) cl_blzk(cl_nn cl_d(read_cz, , x)())
#define write(x...) cl_blzk(cl_nn cl_d(write_cz, , x)())
#define cl_pp(cs, x...) cl_blzk(cl_d(cl_pp_cz, cs, x))
#define cl_pp_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)(template <> struct cs<_1> { typedef _1 Type; };)()
#define cl_d(cz, cs, x...) cl_ds(cz, cs, x)
#define cl_ds(cz, cs, x...) cl_lj(cl_ds_, cl_is_nn(x))(cz, cs, x)
#define cl_ds_1(cz, cs, _1, x...) cz(cs, _1, 0)
#define cl_ds_0(cz, cs, _1, x...) cz(cs, _1, 1) cl_after(cl_ds_cpy)()(cz, cs, x)
#define cl_ds_cpy() cl_ds
#define isdigit(x) (x >= '0' && x <= '9')
#define pp(a, b)                                                               \\
  template <> struct a<b> {                                                    \\
    typedef b Type;                                                            \\
  };
namespace quick_IO {
inline bool blank(char ch) {
  return ch == ' ' || ch == '\\n' || ch == '\\r' || ch == '\\t';
}
ll very_important_cs_scw = 0, very_important_cs_xsd = 6, cs = 0;
inline char gc() { return getchar(); }
inline void pc(char c) { cs ? fprintf(stderr, "%c", c) : putchar(c); }
template <typename T> struct Checker1;
cl_pp(Checker1, int, short, long, long long, unsigned int, unsigned long,
      unsigned long long, double, long double, float) template <typename T>
struct Checker2;
cl_pp(Checker2, char) char lastc = -2;
template <typename T> inline ll readm(typename Checker1<T>::Type &x) {
  register double tmp = 1;
  register bool sign = 0;
  x = 0;
  register char ch = lastc == -2 ? gc() : lastc;
  for (; !isdigit(ch); ch = gc())
    if (ch == '-')
      sign = 1;
    else if (ch == EOF)
      return 0;
  for (; isdigit(ch); ch = gc())
    x = x * 10 + (ch - '0');
  if (ch == '.')
    for (ch = gc(); isdigit(ch); ch = gc())
      tmp /= 10.0, x += tmp * (ch - '0');
  if (sign)
    x = -x;
  lastc = ch;
  return 1;
}
template <typename T> inline ll readm(typename Checker2<T>::Type &c) {
  for (c = lastc == -2 ? gc() : lastc; blank(c); c = gc())
    ;
  if (c == EOF)
    return 0;
  lastc = -2;
  return 1;
}
inline ll readm(char *s) {
  register char ch = lastc == -2 ? gc() : lastc;
  for (; blank(ch); ch = gc())
    if (ch == EOF)
      return 0;
  for (; ch != -1 && !blank(ch); ch = gc())
    *s++ = ch;
  *s = 0;
  lastc = ch;
}
void writellm(ll c, ll x) {
  if (c < 0)
    pc('-'), c = -c, x--;
  if (c < 10)
    return ({
      for (ll i = 1; i <= x - 1; i++)
        pc(' ');
      pc(c ^ 48);
      void(0);
    });
  writellm(c / 10, x - 1);
  pc((c % 10) ^ 48);
}
template <typename T> ll whreadm(T *x) { return readm(x); };
template <typename T> ll whreadm(T &x) { return readm<T>(x); };
#define x very_important_cs_xsd
#define y very_important_cs_scw
template <typename T> void writem(typename Checker2<T>::Type c) {
  for (ll i = 1; i <= y - 1; i++)
    pc(' ');
  pc(c);
}
template <typename T> struct Checkers1;
cl_pp(Checkers1, int, short, long, long long, unsigned int, unsigned long,
      unsigned long long) template <typename T>
inline void ycl(typename Checkers1<T>::Type c) {
  x = 0;
}
template <typename T> void ycl(T c) {}
template <typename T> void writem(typename Checker1<T>::Type c) {
  if (c < 0)
    putchar('-'), c = -c;
  ycl<T>(c);
  long double ys = 0.5;
  for (ll i = 1; i <= x; i++)
    ys /= 10;
  c += ys;
  writellm(ll(c), y - (x ? x + 1 : 0));
  c -= ll(c);
  if (!x)
    return;
  pc('.');
  for (ll i = 1; i <= x; i++)
    c *= 10, pc(char(c) ^ 48), c -= char(c);
}
void writem(const char *c) {
  ll len = std::strlen(c);
  for (ll i = 1; i <= y - len; i++)
    pc(' ');
  while (*c)
    pc(*c++);
}
#undef x
#undef y
template <typename T> void whwritem(T *x) {
  writem(x);
  very_important_cs_scw = 0, very_important_cs_xsd = 6;
};
template <typename T> void whwritem(T x) {
  writem<T>(x);
  very_important_cs_scw = 0, very_important_cs_xsd = 6;
};
} // namespace quick_IO
#define IO_debug 0
#define IO(x)                                                                  \\
  freopen(#x ".in", "r", stdin)                                                \\
      cl_bif(IO_debug)()(; freopen(#x ".out", "w", stdout))
#define bla , (((zjhyyds))),
#define cl_del_3_kh(x...) cl_bif(cl_has_3_kh(x))(cl_del_2_kh x)(x)
#define cl_del_2_kh(x...) cl_bif(cl_has_2_kh(x))(cl_del_1_kh x)(x)
#define cl_del_1_kh(x...) cl_bif(cl_has_1_kh(x))(cl_zkk x)(x)
#define cl_has_3_kh(x...) cl_bif(cl_has_1_kh(x))(cl_has_2_kh x)(0)
#define cl_has_2_kh(x...) cl_bif(cl_has_1_kh(x))(cl_has_1_kh x)(0)
#define cl_has_1_kh(x...) cl_is_nn(cl_nn x)
#define is_zjhyyds(x) cl_bif(cl_has_3_kh(x))(cl_is_nn(is_zjhyyds_(x)))(0)
#define is_zjhyyds_(x) cl_lj(is_zjhyyds_s, cl_del_3_kh(x))
#define is_zjhyyds_szjhyyds
#define cl_rir_dh(cs, x...) cl_zzk(cl_nn cl_rir(cs, (, )x cl_zzk)())
#define cl_rir(cs, x...) cl_blzk(cl_d(cl_rir_cz, (x), cl_zkk cs))
#define cl_rir_cz(cs, _1, _01)                                                 \\
  cl_bif(_01)(cl_after(cl_hg_cpy)()(_1, cl_zkk cs))()
#define cl_hg_cpy() cl_hg
#define cl_hg(cs, x...) cl_nn cl_after(cl_ds_cpy)()(cl_hg_cz, cs, x)()
#define cl_hg_cz(cs, _1, _01)                                                  \\
  cl_bif(_01)(cl_bif(is_zjhyyds(_1))(() cs cl_nn)((, )_1 cl_zkk))(() cl_nn)
ll readll(void) {
  ll x = 0, w = 1;
  char c = getchar();
  for (; c < '0' || c > '9'; (c - '-') || (w = -w), c = getchar())
    ;
  for (; c >= '0' && c <= '9';
       x = (x << 1) + (x << 3) + (c ^ 48), c = getchar())
    ;
  return x * w;
}
#define cl_rill(x...) cl_blzk(cl_nn cl_d(cl_rill_cz, , x)())
#define rill(x...) cl_rill(x)
#define cl_rill_cz(cs, _1, _01) cl_bif(_01)((, )_1 = readll() cl_zkk)(() cl_nn)
#define writeln(x...) cl_bif(cl_is_nn(x))(write('\\n'))(write(x, '\\n'))
#define rep(cs, low, up, x...)                                                 \\
  rfor(ll cs = low; cs <= up; cl_bif(cl_is_nn(x))(cs++)(x))
#define frh(cs, cz, low, up, x...)                                             \\
  rfor(ll cs, cl_lj(WCR_yyds_, cs) = low;                                      \\
       cs = cz[cl_lj(WCR_yyds_, cs)], cl_lj(WCR_yyds_, cs) <= up;              \\
       cl_lj(WCR_yyds_, cs)++) cl_bif(cl_is_nn(x))()(if (x))
#define per(cs, low, up, x...)                                                 \\
  rfor(ll cs = low; cs >= up; cl_bif(cl_is_nn(x))(cs--)(x))
#define cl_hsdd(hs, x...) cl_blzk(cl_bif(cl_is_nn(x))()(cl_hsdd_(hs, x)))
#define cl_hsdd_(hs, _1, x...) cl_lj(cl_hsdd_, cl_is_nn(x))(hs, _1, x)
#define cl_hsdd_1(hs, _1, x...) _1
#define cl_hsdd_0(hs, _1, x...) hs(_1, cl_after(cl_hsdd_cpy)()(hs, x))
#define cl_hsdd_cpy() cl_hsdd_
#define mx(x...) cl_hsdd(std::max, x)
#define mn(x...) cl_hsdd(std::min, x)
#define rfor(x...) for (x)
#define debug(x...) quick_IO::cs = 1, write(x), quick_IO::cs = 0
#define debugln(x...) quick_IO::cs = 1, writeln(x), quick_IO::cs = 0
ll af25[23][23], acnt2[2222222], acnt5[2222222];
int main() {
  // IO(A);
  // x/1000000000=y/(2^a*5^b)
  //	ll rill(n);
  ll n;
  scanf("%lld", &n);
  rep(i, 1, n) {
    double x;
    scanf("%lf", &x);
    //		read(x);
    x *= 1000000000;
    ll y = (ll)(x + 0.3);
    //	writeln(y);
    ll cnt2 = 0, cnt5 = 0;
    if (y == 0) {
      cnt2 = 18, cnt5 = 18;
    } else {
      while (!(y % 2))
        y /= 2, cnt2++;
      while (!(y % 5))
        y /= 5, cnt5++;
    }
    acnt2[i] = mn(18ll, cnt2), acnt5[i] = mn(18ll, cnt5);
    af25[cnt2][cnt5]++;
  }
  per(i, 18, 0) per(j, 18, 0) af25[i][j] +=
      af25[i + 1][j] + af25[i][j + 1] - af25[i + 1][j + 1];
  ll ans = 0;
  rep(i, 1, n) {
    ans += af25[18 - acnt2[i]][18 - acnt5[i]];
    //		printf("%lld\\n",ans);
    //	writeln(ans);
    if (acnt2[i] >= 9 && acnt5[i] >= 9)
      ans--;
  }
  printf("%lld\\n", ans / 2);
  return 0;
}