Submission #342657

#	Time	Username	Problem	Language	Result	Execution time	Memory
342657		koketsu	Chessboard (IZhO18_chessboard)	C++14	8 / 100	22 ms	364 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;

bool Prime(int N){
    bool Used = false;
    for(int i = 2; i <= sqrt(N); i++){
        if(N % i == 0){
            Used = true;
            break;
        }
    }
    return Used;
}

bool Get(int x, int y){
    return (x + y) % 2;
}

void Ans1(int N){
    int Ans = Mxn;
    for(int i = 1; i < N; i++){
        if(N % i == 0){
            Ans = min(Ans, (N * N) / (2 * i * i) * (i * i));
        }
    }
    cout << Ans;
}

void Ans2(int N, int K){
    int cnt[2] = {0, 0};
    for(int i = 1; i <= K; i++){
        int x1, y1, x2, y2;
        cin >> x1 >> y1 >> x2 >> y2;
        bool Num = Get(y2, x2);
        for(int x = x1; x <= x2; x++)
            for(int y = y1; y <= y2; y++){
                cnt[(x+y)%2]++;
		}
    }
    cout << min((N * N) / 2 - cnt[1] + cnt[0], (N * N) / 2 + 1 - cnt[0] + cnt[1]);
}

int main(){
    Kultivator;
    LL N, K;
    cin >> N >> K;
    if(!K){
        Ans1(N);
    } else if(!Prime(N)){
        Ans2(N, K);
    }
    //cout << Prime(N);
}

Compilation message (stderr)

chessboard.cpp: In function 'void Ans2(int, int)':
chessboard.cpp:42:14: warning: unused variable 'Num' [-Wunused-variable]
   42 |         bool Num = Get(y2, x2);
      |              ^~~

• Subtask 1: 8 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 23
• Subtask 6: 0 / 30