Submission #10230940

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int MAX = 1e5 + 10;
int prime[MAX], tag[MAX];
void is_Prime(){
	int cnt = 0;
	prime[++cnt] = 2;
	tag[1] = 1;
	for( int i = 2; i < MAX; i++){
		if(!tag[i])
			prime[++cnt] = i;
		for(int j = 1; j <= cnt && i * prime[j] < MAX; j++){
			tag[i * prime[j]] = 1;
			if( i % prime[j] == 0)
				break;
		}
	}
}
int main(){
	int t, l, r, num = 0;
	is_Prime();
	cin >> t;
	while(t--){
		scanf("%d%d", &l, &r);
		for( int i = l; i <= r; i++){
			if(!tag[i] && !tag[( i + 1) / 2])
				num++;
		}
		cout << num << endl;;
		num = 0;
	}
	return  0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &l, &r);
                        ^

Judge Result