제출 #1122332

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1122332		deera	축구 경기장 (IOI23_soccer)	C++17	6 / 100	276 ms	39576 KiB

soccer

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

struct Point {
    int x, y;
    Point(int x, int y): x(x), y(y) {}
};

int biggest_stadium(int N, vector<vector<int>> F) {
    int num_trees = 0;
    for (auto i: F) for (int j: i) num_trees += j;

    if (num_trees == 0) {
        return N*N;
    }
    
    if (num_trees == 1) {
        int x, y;
        for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) 
            if (F[i][j] == 1) {
                x = i, y = j; 
                break;
            }

        return N*N - min(x + 1, N - x) * min(y + 1, N - y);
    }

    for (int i = 0; i < N; i++) {
        F[i].insert(F[i].begin(), 1);
        F[i].push_back(1);
    }

    F.insert(F.begin(), vector<int>(N + 2, 1));
    F.push_back(vector<int>(N + 2, 1));

    N += 2;


    auto valid = [&](int n) {
        return n >= 0 && n < N;
    };

    int dirs[4][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};

    vector<vector<bool>> seen(N, vector<bool>(N, false));
    queue<tuple<int, int, bool>> q;

    bool f1 = false, f0 = false;
    for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) {
        if (!f1 && F[i][j] == 1)
            q.push({i, j, true}), f1 = true;
        if (!f0 && F[i][j] == 0)
            q.push({i, j, false}), f0 = true;
    }

    while (!q.empty()) {
        auto [x, y, t] = q.front();
        q.pop();
        seen[x][y] = true;

        for (auto [dx, dy]: dirs) {
            int nx = x + dx, ny = y + dy;
            if (valid(nx) && valid(ny) && !seen[nx][ny] && F[nx][ny] == t)
                q.push({nx, ny, t});
        }
    }

    for (int i = 0; i < N; i++) for (int j = 0; j < N; j++)
        if (!seen[i][j]) return 0; // islands!!!

    
    // most extreme zeros
    Point minx = {N, N}, maxx = {0, 0}, miny = {N, N}, maxy = {0, 0};
    for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) {
        if (F[i][j] == 0) {
            if (i < minx.x) minx = {i, j};
            if (i > maxx.x) maxx = {i, j};
            if (j < miny.y) miny = {i, j};
            if (j > maxy.y) maxy = {i, j};
        }
    }

    Point points[4] = {minx, maxx, miny, maxy};
    for (int i = 0; i < 4; i++) for (int j = i + 1; j < 4; j++) {
        if (i == j) continue;

        if (F[points[i].x][points[j].y] + F[points[j].x][points[i].y] == 2) {
            return 0; // 3 or more kicks
        }
    }

    int zeros = 0;
    for (int i = 0; i < N; i++) for (int j = 0; j < N; j++) {
        if (F[i][j] == 0) zeros++;
    }

    return zeros;
}

컴파일 시 표준 에러 (stderr) 메시지

soccer.cpp: In function 'int biggest_stadium(int, std::vector<std::vector<int> >)':
soccer.cpp:25:48: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |         return N*N - min(x + 1, N - x) * min(y + 1, N - y);
      |                                              ~~^~~
soccer.cpp:25:28: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |         return N*N - min(x + 1, N - x) * min(y + 1, N - y);
      |                          ~~^~~

• Subtask 0: 0 / 0
• Subtask 1: 6 / 6
• Subtask 2: 0 / 8
• Subtask 3: 0 / 22
• Subtask 4: 0 / 18
• Subtask 5: 0 / 16
• Subtask 6: 0 / 30