제출 #430885

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
430885		Hideo	IOI 바이러스 (JOI21_fever)	C++17	0 / 100	1 ms	296 KiB

fever

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

#define all(s) s.begin(), s.end()
#define ll long long
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define pi pair < int, int >

const int N = 3007;
const int INF = 1e9 + 7;

pi d[4] = {{1, 0}, {-1, 0}, {0, -1}, {0, 1}};

int x[N], y[N];
int us[N];
int n, ans;

int check (int v, int u, int k){
    if (abs(x[v] - x[u]) != abs(y[v] - y[u])){
        if (x[v] == x[u]){

        }
        else if (y[v] == y[u]){

        }
        return -1;
    }
    if (k == 0){
        if (x[u] < x[v])
            return -1;
        if (y[u] > y[v])
            return 2;
        else
            return 3;
    }
    if (k == 1){
        if (x[u] > x[v])
            return -1;
        if (y[u] > y[v])
            return 2;
        else
            return 3;
    }
    if (k == 2){
        if (y[u] > y[v])
            return -1;
        if (x[u] > x[v])
            return 1;
        else
            return 0;
    }
    if (k == 3){
        if (y[u] < y[v])
            return -1;
        if (x[u] > x[v])
            return 1;
        else
            return 0;
    }
}

int solve (int v, int k){
    us[v] = 1;
    int r = 1;
    for (int i = 1; i <= n; i++){
        if (us[i])
            continue;
        int nk = check(v, i, k);
        if (nk != -1){
            r += solve(i, nk);
        }
    }
    return r;
}

main (){
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> x[i] >> y[i];
    }
    ans = max(ans, solve(1, 0));
    memset(us, 0, sizeof(us));
    ans = max(ans, solve(1, 1));
    memset(us, 0, sizeof(us));
    ans = max(ans, solve(1, 2));
    memset(us, 0, sizeof(us));
    ans = max(ans, solve(1, 3));
    cout << ans;
}

컴파일 시 표준 에러 (stderr) 메시지

fever.cpp:79:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   79 | main (){
      | ^~~~
fever.cpp: In function 'int check(int, int, int)':
fever.cpp:63:1: warning: control reaches end of non-void function [-Wreturn-type]
   63 | }
      | ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 8
• Subtask 3: 0 / 6
• Subtask 4: 0 / 6
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32
• Subtask 7: 0 / 31