Problem p03743 (C++)

Buggy submission (status: Runtime Error):
#include <bits/stdc++.h>
#define sqr(x) ((x) * (x))
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define ld long double
#define vi vector<int>
#define HEAP(...) priority_queue<__VA_ARGS__>
#define heap(...)                                                              \
  priority_queue<__VA_ARGS__, vector<__VA_ARGS__>, greater<__VA_ARGS__>>
#define pii pair<int, int>
#define pb push_back
#define mp make_pair
#define debuge cerr << "isok" << endl
#define debug(x) cerr << #x << "=" << x << endl
#define dprintf(...) fprintf(stderr, __VA_ARGS__)
#define SS second
#define FF first
#define ls (k << 1)
#define rs (k << 1 | 1)
#define clr(a, x) memset(a, x, sizeof(a))
#define cpy(a, x) memcpy(a, x, sizeof(a))
#define file(x) freopen(x ".in", "r", stdin), freopen(x ".out", "w", stdout)
#define SZ(x) ((int)x.size())
using namespace std;
template <class T> inline void gmin(T &x, const T &y) {
  if (x > y)
    x = y;
}
template <class T> inline void gmax(T &x, const T &y) {
  if (x < y)
    x = y;
}
const int BufferSize = 1 << 16;
char buffer[BufferSize], *Bufferhead, *Buffertail;
bool Terminal;
inline char Getchar() {
  if (Bufferhead == Buffertail) {
    int l = fread(buffer, 1, BufferSize, stdin);
    if (!l) {
      Terminal = 1;
      return 0;
    }
    Buffertail = (Bufferhead = buffer) + l;
  }
  return *Bufferhead++;
}
template <class T> inline bool read(T &x) {
  x = 0;
  char c = Getchar(), rev = 0;
  while (c < '0' || c > '9') {
    c = Getchar();
    rev |= c == '-';
    if (Terminal)
      return 0;
  }
  while (c >= '0' && c <= '9')
    x = x * 10 + c - '0', c = Getchar();
  if (c == '.') {
    c = Getchar();
    double t = 0.1;
    while (c >= '0' && c <= '9')
      x = x + (c - '0') * t, c = Getchar(), t = t / 10;
  }
  x = rev ? -x : x;
  return 1;
}
template <class T1, class T2> inline bool read(T1 &x, T2 &y) {
  return read(x) & read(y);
}
template <class T1, class T2, class T3> inline bool read(T1 &x, T2 &y, T3 &z) {
  return read(x) & read(y) & read(z);
}
template <class T1, class T2, class T3, class T4>
inline bool read(T1 &x, T2 &y, T3 &z, T4 &w) {
  return read(x) & read(y) & read(z) & read(w);
}
inline bool reads(char *x) {
  char c = Getchar();
  while (c < 33 || c > 126) {
    c = Getchar();
    if (Terminal)
      return 0;
  }
  while (c >= 33 && c <= 126)
    (*x++) = c, c = Getchar();
  *x = 0;
  return 1;
}
template <class T> inline void print(T x, const char c = '\n') {
  if (!x) {
    putchar('0');
    putchar(c);
    return;
  }
  if (x < 0)
    putchar('-'), x = -x;
  int m = 0, a[20];
  while (x)
    a[m++] = x % 10, x /= 10;
  while (m--)
    putchar(a[m] + '0');
  putchar(c);
}
//--------------------------------head---------------------------------------------

const int inf = 1e9;
const int N = 100005, M = 100005, mod = 1e9 + 7;
template <class T, class S> inline void ch(T &x, const S y) {
  x = (x + y) % mod;
}
inline int exp(int x, int y, const int mod = ::mod) {
  int ans = 1;
  while (y) {
    if (y & 1)
      ans = (ll)ans * x % mod;
    x = (ll)x * x % mod;
    y >>= 1;
  }
  return ans;
}

int n, D, Q, a[N], b[N], c[N];
set<int> s[N];

int main() {
#ifdef rqgao2014
  freopen("input.txt", "r", stdin);
#endif
  read(n, D);
  for (int i = 1; i <= n; i++)
    read(a[i]);
  s[n + 1].insert(0);
  b[0] = D;
  for (int i = 1; i <= n; i++)
    b[i] = min(b[i - 1], abs(b[i - 1] - a[i]));
  c[n + 1] = 0;
  for (int i = n; i; i--)
    if (a[i] <= c[i + 1] * 2 + 1)
      c[i] = c[i + 1] + a[i];
    else
      c[i] = c[i + 1];
  read(Q);
  for (int i = 1; i <= Q; i++) {
    int x, isok = 0;
    read(x);
    puts(b[x - 1] > c[x + 1] ? "YES" : "NO");
  }
  return 0;
}

Fixed submission:
#include <bits/stdc++.h>
#define sqr(x) ((x) * (x))
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define ld long double
#define vi vector<int>
#define HEAP(...) priority_queue<__VA_ARGS__>
#define heap(...)                                                              \
  priority_queue<__VA_ARGS__, vector<__VA_ARGS__>, greater<__VA_ARGS__>>
#define pii pair<int, int>
#define pb push_back
#define mp make_pair
#define debuge cerr << "isok" << endl
#define debug(x) cerr << #x << "=" << x << endl
#define dprintf(...) fprintf(stderr, __VA_ARGS__)
#define SS second
#define FF first
#define ls (k << 1)
#define rs (k << 1 | 1)
#define clr(a, x) memset(a, x, sizeof(a))
#define cpy(a, x) memcpy(a, x, sizeof(a))
#define file(x) freopen(x ".in", "r", stdin), freopen(x ".out", "w", stdout)
#define SZ(x) ((int)x.size())
using namespace std;
template <class T> inline void gmin(T &x, const T &y) {
  if (x > y)
    x = y;
}
template <class T> inline void gmax(T &x, const T &y) {
  if (x < y)
    x = y;
}
const int BufferSize = 1 << 16;
char buffer[BufferSize], *Bufferhead, *Buffertail;
bool Terminal;
inline char Getchar() {
  if (Bufferhead == Buffertail) {
    int l = fread(buffer, 1, BufferSize, stdin);
    if (!l) {
      Terminal = 1;
      return 0;
    }
    Buffertail = (Bufferhead = buffer) + l;
  }
  return *Bufferhead++;
}
template <class T> inline bool read(T &x) {
  x = 0;
  char c = Getchar(), rev = 0;
  while (c < '0' || c > '9') {
    c = Getchar();
    rev |= c == '-';
    if (Terminal)
      return 0;
  }
  while (c >= '0' && c <= '9')
    x = x * 10 + c - '0', c = Getchar();
  if (c == '.') {
    c = Getchar();
    double t = 0.1;
    while (c >= '0' && c <= '9')
      x = x + (c - '0') * t, c = Getchar(), t = t / 10;
  }
  x = rev ? -x : x;
  return 1;
}
template <class T1, class T2> inline bool read(T1 &x, T2 &y) {
  return read(x) & read(y);
}
template <class T1, class T2, class T3> inline bool read(T1 &x, T2 &y, T3 &z) {
  return read(x) & read(y) & read(z);
}
template <class T1, class T2, class T3, class T4>
inline bool read(T1 &x, T2 &y, T3 &z, T4 &w) {
  return read(x) & read(y) & read(z) & read(w);
}
inline bool reads(char *x) {
  char c = Getchar();
  while (c < 33 || c > 126) {
    c = Getchar();
    if (Terminal)
      return 0;
  }
  while (c >= 33 && c <= 126)
    (*x++) = c, c = Getchar();
  *x = 0;
  return 1;
}
template <class T> inline void print(T x, const char c = '\n') {
  if (!x) {
    putchar('0');
    putchar(c);
    return;
  }
  if (x < 0)
    putchar('-'), x = -x;
  int m = 0, a[20];
  while (x)
    a[m++] = x % 10, x /= 10;
  while (m--)
    putchar(a[m] + '0');
  putchar(c);
}
//--------------------------------head---------------------------------------------

const int inf = 1e9;
const int N = 1000005, M = 100005, mod = 1e9 + 7;
template <class T, class S> inline void ch(T &x, const S y) {
  x = (x + y) % mod;
}
inline int exp(int x, int y, const int mod = ::mod) {
  int ans = 1;
  while (y) {
    if (y & 1)
      ans = (ll)ans * x % mod;
    x = (ll)x * x % mod;
    y >>= 1;
  }
  return ans;
}

int n, D, Q, a[N], b[N], c[N];
set<int> s[N];

int main() {
#ifdef rqgao2014
  freopen("input.txt", "r", stdin);
#endif
  read(n, D);
  for (int i = 1; i <= n; i++)
    read(a[i]);
  s[n + 1].insert(0);
  b[0] = D;
  for (int i = 1; i <= n; i++)
    b[i] = min(b[i - 1], abs(b[i - 1] - a[i]));
  c[n + 1] = 0;
  for (int i = n; i; i--)
    if (a[i] <= c[i + 1] * 2 + 1)
      c[i] = c[i + 1] + a[i];
    else
      c[i] = c[i + 1];
  read(Q);
  for (int i = 1; i <= Q; i++) {
    int x, isok = 0;
    read(x);
    puts(b[x - 1] > c[x + 1] ? "YES" : "NO");
  }
  return 0;
}