Submission #642917

#	Time	Username	Problem	Language	Result	Execution time	Memory
642917		valerikk	Worst Reporter 3 (JOI18_worst_reporter3)	C++17	100 / 100	663 ms	23192 KiB

worst_reporter3

#include <cstdio>

#define MAXN 500005
#define MAXT 1000000001
#define MAXK 65

int N, Q;
int D[MAXN];
int W[MAXN], C[MAXN], S[MAXN];
int Z[MAXK], K;

int count(int T, int L) {
  if (T < L)
    return 0;

  for (int i = 0, t = T; i < K; ++i) {
    S[i] = t % C[Z[i]] * W[Z[i]];
    t /= C[Z[i]];
  }

  int low = 0, high = N + 1;
  while (high - low > 1) {
    int mid = (low + high) / 2;

    int X = T - mid;
    for (int i = 0; i < K && Z[i] <= mid; ++i) {
      X -= S[i];
    }

    if (X >= L) 
      low = mid;
    else
      high = mid;
  }
  
  return low + 1;
}

int main() {
  scanf("%d%d", &N, &Q);
  for (int i = 1; i <= N; ++i) {
    scanf("%d", &D[i]);
  }

  W[1] = 1;
  C[1] = D[1];
  for (int i = 2; i <= N; ++i) {
    if (MAXT / C[i - 1] < W[i - 1])
      W[i] = MAXT;
    else
      W[i] = C[i - 1] * W[i - 1];
    
    C[i] = (D[i] + W[i] - 1) / W[i];
    if (C[i] > MAXT)
      C[i] = MAXT;
  }

  for (int i = 1; i <= N; ++i) {
    if (C[i] != 1) 
      Z[K++] = i;
  }

  while (Q--) {
    int T, L, R;
    scanf("%d%d%d", &T, &L, &R);
    printf("%d\n", count(T, L) - count(T, R + 1));
  }
}

Compilation message (stderr)

worst_reporter3.cpp: In function 'int main()':
worst_reporter3.cpp:40:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |   scanf("%d%d", &N, &Q);
      |   ~~~~~^~~~~~~~~~~~~~~~
worst_reporter3.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     scanf("%d", &D[i]);
      |     ~~~~~^~~~~~~~~~~~~
worst_reporter3.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     scanf("%d%d%d", &T, &L, &R);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 81 / 81