Submission #64553517

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Source Code Expand

#include <bits/stdc++.h>
#define int long long
using namespace std;

constexpr int MAXN = 1e6;
int q, x, T[MAXN + 5];
bool isprime[MAXN + 5];
vector<int> prime, vec;

inline void getprime() {
    for (int i = 2; i <= MAXN; i ++) {
        if (!isprime[i]) 
            prime.push_back(i);
        for (int j : prime) {
            if (i * j > MAXN) break;
            isprime[i * j] = true;
            if (!(i % j)) break;
        }
    }
}

signed main() {
    getprime();
    for (int i : prime) {
        for (int j = i; j <= MAXN; j += i) T[j] ++;
    }
    for (int i = 1; i <= MAXN; i ++) {
        if (T[i] == 2)
            vec.push_back (i * i);
    }
    scanf ("%lld", &q);
    while (q --) {
        scanf ("%lld", &x);
        printf ("%lld\n", *(upper_bound (vec.begin(), vec.end(), x) - 1));
    }
    return 0;
}

Submission Info

Compile Error

Main.cpp: In function ‘int main()’:
Main.cpp:31:11: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   31 |     scanf ("%lld", &q);
      |     ~~~~~~^~~~~~~~~~~~
Main.cpp:33:15: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   33 |         scanf ("%lld", &x);
      |         ~~~~~~^~~~~~~~~~~~

Judge Result