제출 #342591

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
342591		koketsu	Chessboard (IZhO18_chessboard)	C++14	0 / 100	1 ms	376 KiB

chessboard

#include <bits/stdc++.h>
#define pb push_back
#define LL long long
#define Kultivator ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

const LL Mxn = 1e6 + 7;
const LL Mod = 1e9 + 7;
const LL Inf = 1e14 + 7;

int Get(int N){
    int Ans = 1;
    for(int i = 2; i <= sqrt(N); i++){
        if(N % i == 0){
            Ans = max(Ans, i);
            if(N / i != i){
                Ans = max(Ans, N / i);
            }
        }
    }
    return Ans;
}

int main(){
    Kultivator;
    int N, K;
    cin >> N >> K;
    int Del = Get(N);
    if(N == 2){
        cout << 2;
    }
    else if(Del > 1){
        cout << (N / Del) * N;
    } else {
        cout << ((N - 1) / 2 * (N / 2 + 1)) + ((N + 1) / 2 * (N / 2));
    }

}

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