Submission #1100250

#	Time	Username	Problem	Language	Result	Execution time	Memory
1100250		vjudge1	Maxcomp (info1cup18_maxcomp)	C++17	Compilation error	0 ms	0 KiB

maxcomp

#include <iostream>
#include <vector>
#include <queue>
#include <algorithm>

using namespace std;

int n, m;
vector<vector<int>> mat;

struct C {
    int x, y;
};

int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};

bool valid(int x, int y) {
    return x >= 0 && x < n && y >= 0 && y < m;
}

bool connected(const vector<C>& sub) {
    if (sub.empty()) return false;

    vector<vector<bool>> vis(n, vector<bool>(m, false));
    queue<C> q;

    q.push(sub[0]);
    vis[sub[0].x][sub[0].y] = true;
    int cnt = 1;

    while (!q.empty()) {
        C curr = q.front();
        q.pop();

        for (int d = 0; d < 4; ++d) {
            int nx = curr.x + dx[d];
            int ny = curr.y + dy[d];

            if (valid(nx, ny) && !vis[nx][ny]) {
                for (const auto& c : sub) {
                    if (c.x == nx && c.y == ny) {
                        vis[nx][ny] = true;
                        q.push({nx, ny});
                        cnt++;
                        break;
                    }
                }
            }
        }
    }

    return cnt == sub.size();
}

int weight(const vector<C>& sub) {
    int maxV = INT_MIN, minV = INT_MAX;
    for (const auto& c : sub) {
        maxV = max(maxV, mat[c.x][c.y]);
        minV = min(minV, mat[c.x][c.y]);
    }

    return maxV - minV - sub.size();
}

int main() {
    cin >> n >> m;
    mat.resize(n, vector<int>(m));

    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            cin >> mat[i][j];
        }
    }

    int maxW = INT_MIN;
    int totalCells = n * m;

    for (int mask = 1; mask < (1 << totalCells); ++mask) {
        vector<C> sub;

        for (int i = 0; i < totalCells; ++i) {
            if (mask & (1 << i)) {
                int x = i / m;
                int y = i % m;
                sub.push_back({x, y});
            }
        }

        if (connected(sub)) {
            int w = weight(sub);
            maxW = max(maxW, w);
        }
    }

    cout << maxW << endl;

    return 0;
}

Compilation message (stderr)

maxcomp.cpp: In function 'bool connected(const std::vector<C>&)':
maxcomp.cpp:53:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<C>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     return cnt == sub.size();
      |            ~~~~^~~~~~~~~~~~~
maxcomp.cpp: In function 'int weight(const std::vector<C>&)':
maxcomp.cpp:57:16: error: 'INT_MIN' was not declared in this scope
   57 |     int maxV = INT_MIN, minV = INT_MAX;
      |                ^~~~~~~
maxcomp.cpp:5:1: note: 'INT_MIN' is defined in header '<climits>'; did you forget to '#include <climits>'?
    4 | #include <algorithm>
  +++ |+#include <climits>
    5 | 
maxcomp.cpp:60:9: error: 'minV' was not declared in this scope
   60 |         minV = min(minV, mat[c.x][c.y]);
      |         ^~~~
maxcomp.cpp:63:19: error: 'minV' was not declared in this scope
   63 |     return maxV - minV - sub.size();
      |                   ^~~~
maxcomp.cpp: In function 'int main()':
maxcomp.cpp:76:16: error: 'INT_MIN' was not declared in this scope
   76 |     int maxW = INT_MIN;
      |                ^~~~~~~
maxcomp.cpp:76:16: note: 'INT_MIN' is defined in header '<climits>'; did you forget to '#include <climits>'?