Submission #1131236

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Source Code Expand

#include <algorithm>
#include <cassert>
#include <cstring>
#include <iostream>

using namespace std;

#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) FOR(i, 0, n)
#define TRACE(x) cout << #x << " = " << x << endl
#define _ << " _ " <<

typedef long long llint;

const int mod = 1e9 + 7;

inline int add(int a, int b) {
  return a+b >= mod ? a+b-mod : a+b;
}

inline int sub(int a, int b) {
  return a >= b ? a-b : a-b+mod;
}

inline int mul(int a, int b) {
  return llint(a)*b % mod;
}

int main(void) {
  int n;
  scanf("%d", &n);
  
  int c = 0;
  int ans = 1;
  REP(i, n) {
    int x;
    scanf("%d", &x);

    if (c == 0) {
      c++;
    } else {
      if (x == 2*c) {
        ans = mul(ans, c+1);
      } else {
        c++;
      }
    }
  }

  REP(i, c) ans = mul(ans, i+1);
  printf("%d\n", ans);
  
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
./Main.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &x);
                    ^

Judge Result