Submission #2540370

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Source Code Expand

#include<stdio.h>
#include<iostream>
#include<string>
#include<algorithm>
#include<utility>
#include<vector>
#include<map>
#include<set>
#include<functional>
#include<iterator>
#include<math.h>

using namespace std;

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);

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

	int mem[50000] = {};
	mem[0]=-1;
	mem[1]=1;
	mem[2]=1;
	mem[3]=1;
	int l,r;
	int hl,hr;
	int ans=0;
	for(int i=0;i<q;i++){
		scanf("%d %d", &l, &r);

		if(l==1 || l==3){
			hl = 3;
			ans++; 		//hl = 2
		}
		else{
			hl = (l+1)/2;
			if(hl % 2 == 0) hl++;
		}
		hr = (r+1)/2;
											
		for(int j=hl;j<=hr;j+=2){ // jは3以上の奇数
			if(mem[j-1] == 0){  //初
				//cout << "first\n";
				int k;
				for(k=3; k <= j/2; k+=2){
					if(j%k == 0){
						mem[j-1] = -1;
						//cout << "a " <<  j << " " << k << mem[j-1] << "\n";
						break;
					}
				}
				if(k > j/2){

					int J = 2*j-1;
					int kk;
					for(kk=3; kk <= J/2; kk+=2){
						if(J%kk == 0){
							mem[j-1] = -1;
							//cout << "b " <<  j << " " << k << " " << kk << " " << mem[j-1] << "\n";
							break;
						}
					}
					if(kk > J/2){
						mem[j-1] = 1;
						//cout << "c " <<  j << " " << k << " " << kk << " " << mem[j-1] << "\n";
						ans++;
					}	
				}
			}else if(mem[j-1] == 1)	ans++;
		}
		printf("%d\n", ans);
		ans = 0;
	}

	//cout << mem[1] << " " << mem[2] << " " << mem[3] << " " << mem[4] << "\n"; 
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &q);
                 ^
./Main.cpp:31:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &l, &r);
                         ^

Judge Result