Problem p02702 (C++) — buggy submission, verdict: Runtime Error

#include <bits/stdc++.h>
using namespace std;

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for (int64 i = 0; i < (n); i++)
#define FOR(i, a, b) for (int64 i = (a); i < (b); i++)
#define all(x) x.begin(), x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-10;

template <typename A, typename B> inline void chmin(A &a, B b) {
  if (a > b)
    a = b;
}
template <typename A, typename B> inline void chmax(A &a, B b) {
  if (a < b)
    a = b;
}

template <typename T> vector<T> make_v(size_t a) { return vector<T>(a); }

template <typename T, typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

template <typename T, typename U, typename... V>
typename enable_if<is_same<T, U>::value != 0>::type fill_v(U &u, const V... v) {
  u = U(v...);
}

template <typename T, typename U, typename... V>
typename enable_if<is_same<T, U>::value == 0>::type fill_v(U &u, const V... v) {
  for (auto &e : u)
    fill_v<T>(e, v...);
}

int64 N, P;
int64 mpow(int64 a, int64 b, int64 P) {
  if (b == 0)
    return 1;
  if (b % 2)
    return a * mpow(a, b - 1, P) % P;
  int64 ret = mpow(a, b / 2, P);
  return ret * ret % P;
}

int main(void) {
  cin.tie(0);
  ios::sync_with_stdio(false);
  string s;
  int64 P1 = 3, P2 = 673;
  cin >> s;
  int64 now1 = 0, now2 = 0, res = 0;
  map<pair<int64, int64>, int64> cnt;
  cnt[{0, 0}]++;
  int64 div = 1;
  int64 d101 = mpow(10 % P1, P1 - 2, P1);
  int64 d102 = mpow(10 % P2, P2 - 2, P2);
  REP(i, s.size()) {
    now1 = now1 * 10 + s[i] - '0';
    now2 = now2 * 10 + s[i] - '0';

    now1 %= P1;
    now2 %= P2;
    res += cnt[{now1 * mpow(d101, i, P1) % P1, now2 * mpow(d102, i, P2) % P2}];
    cnt[{now1 * mpow(d101, i, P1) % P1, now2 * mpow(d102, i, P2) % P2}]++;
  }
  cout << res << endl;
}


Error: -8

Fixed submission:

#include <bits/stdc++.h>
using namespace std;

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for (int64 i = 0; i < (n); i++)
#define FOR(i, a, b) for (int64 i = (a); i < (b); i++)
#define all(x) x.begin(), x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-10;

template <typename A, typename B> inline void chmin(A &a, B b) {
  if (a > b)
    a = b;
}
template <typename A, typename B> inline void chmax(A &a, B b) {
  if (a < b)
    a = b;
}

template <typename T> vector<T> make_v(size_t a) { return vector<T>(a); }

template <typename T, typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

template <typename T, typename U, typename... V>
typename enable_if<is_same<T, U>::value != 0>::type fill_v(U &u, const V... v) {
  u = U(v...);
}

template <typename T, typename U, typename... V>
typename enable_if<is_same<T, U>::value == 0>::type fill_v(U &u, const V... v) {
  for (auto &e : u)
    fill_v<T>(e, v...);
}

int64 N, P;
int64 mpow(int64 a, int64 b) {
  if (b == 0)
    return 1;
  if (b % 2)
    return a * mpow(a, b - 1) % P;
  int64 ret = mpow(a, b / 2);
  return ret * ret % P;
}

int main(void) {
  cin.tie(0);
  ios::sync_with_stdio(false);
  string s;
  int64 P1 = 3, P2 = 673;
  cin >> s;
  int64 now1 = 0, now2 = 0, res = 0;
  map<pair<int64, int64>, int64> cnt;
  cnt[{0, 0}]++;
  int64 div = 1;
  int64 d101 = mpow(10 % P1, P1 - 2);
  int64 d102 = mpow(10 % P2, P2 - 2);
  REP(i, s.size()) {
    now1 = now1 * 10 + s[i] - '0';
    now2 = now2 * 10 + s[i] - '0';

    now1 %= P1;
    now2 %= P2;
    res += cnt[{now1 * mpow(d101, i) % P1, now2 * mpow(d102, i) % P2}];
    cnt[{now1 * mpow(d101, i) % P1, now2 * mpow(d102, i) % P2}]++;
  }
  cout << res << endl;
}