Submission #408612

#	Time	Username	Problem	Language	Result	Execution time	Memory
408612		syl123456	Land of the Rainbow Gold (APIO17_rainbow)	C++17	11 / 100	3058 ms	1048580 KiB

rainbow

#include "rainbow.h"
#include <bits/stdc++.h>
using namespace std;
vector<vector<bool>> b;
vector<int> p;
int m;
void init(int R, int C, int sr, int sc, int M, char *S) {
    m = C;
    b.assign(R, vector<bool>(C, false));
    p.resize(R * C);
    --sr, --sc;
    b[sr][sc] = true;
    for (int i = 0; i < M; ++i) {
        if (S[i] == 'N') --sr;
        else if (S[i] == 'S') ++sr;
        else if (S[i] == 'W') --sc;
        else ++sc;
        b[sr][sc] = true;
    }
}

int colour(int ar, int ac, int br, int bc) {
    --ar, --ac;
    int _ = 0;
    for (int i = ar; i < br; ++i) for (int j = ac; j < bc; ++j)
        p[i * m + j] = i * m + j;
    function<int(int)> find = [&](int i) {
        return p[i] = p[i] == i ? i : find(p[i]);
    };
    for (int i = ar; i < br; ++i) for (int j = ac; j < bc; ++j) if (!b[i][j]) {
        if (i < br - 1 && !b[i + 1][j])
            p[find(i * m + j)] = find((i + 1) * m + j);
        if (j < bc - 1 && !b[i][j + 1])
            p[find(i * m + j)] = find(i * m + j + 1);
    }
    int ans = 0;
    for (int i = ar; i < br; ++i) for (int j = ac; j < bc; ++j) if (!b[i][j])
        ans += find(i * m + j) == i * m + j;
    return ans;
}

Compilation message (stderr)

rainbow.cpp: In function 'int colour(int, int, int, int)':
rainbow.cpp:24:9: warning: unused variable '_' [-Wunused-variable]
   24 |     int _ = 0;
      |         ^

• Subtask 1: 11 / 11
• Subtask 2: 0 / 12
• Subtask 3: 0 / 24
• Subtask 4: 0 / 27
• Subtask 5: 0 / 26