Submission

Score: 100

User: TonnamSora

Problemset: จำนวนเฉพาะ (2560)

Language: c

Time: 0.001 second

Submitted On: 2025-08-22 21:27:52

#include <stdio.h>
#include <math.h>
#include <string.h>

int prime(int N){
    int a[N + 1];
    for(int i = 0; i < N; i++){
        a[i] = 1;
    }
    a[0] = 0, a[1] = 0;
    for(int i = 2; i * i < N; i++){
        if(a[i] == 1){
            for(int j = i * i; j <= N; j += i){
                a[j] = 0;
            }
        }
    }
    for(int i = 0; i <= N; i++){
        if(a[i] == 1){
            printf("%d\n", i);
        }
    }
}

int main(){
    int x;
    scanf("%d", &x);
    prime(x);
    return 0;
}