Submission #41111

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
using namespace std;

#define REPN(i, a, b) for(int i = (int)(a); i < (int)(b); i++)
#define REP(i, n) REPN(i, 0, n)
#define FOR(i, c) for(__typeof((c).begin()) i = (c).begin(); i != (c).end(); i++)
#define ALL(v) (v).begin(), (v).end()

int main() {

  int N;
  scanf("%d", &N);

  bool isprime[10010];
  fill(isprime, isprime + 10010, true);
  isprime[0] = isprime[1] = false;
  
  for(int p = 2; p * p < N; ) {
    for(int i = p * p; i < N; i += p) isprime[i] = false;
    for(int i = p + 1; i < N; i++) {
      if(isprime[i]) { 
        p = i;
        break;
      }
    }
  }

  int res = 0;
  for(int i = 0; i < N; i++) {
    if(isprime[i]) res++;
  }
  
  printf("%d\n", res);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]

Judge Result