Submission #1244784

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244784		SpyrosAliv	Paint By Numbers (IOI16_paint)	C++20	32 / 100	15 ms	328 KiB

paint

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

bool pos(string s, vector<int> c) {
    int n = s.size();
    int k = c.size();
    vector<vector<bool>> dp(n+2, vector<bool>(k+1, false));
    vector<int> ps(n, 0);
    if (s[0] == '_') ps[0] = 1;
    for (int i = 1; i < n; i++) {
        ps[i] = ps[i-1];
        if (s[i] == '_') ps[i]++;
    }
    for (int i = 0; i <= n+1; i++) dp[i][k] = true;
    for (int curr = k-1; curr >= 0; curr--) {
        for (int i = n-1; i >= 0; i--) {
            int upto = i + c[curr] - 1;
            if (upto >= n) continue;
            if (upto < n-1 && s[upto+1] == 'X') continue;
            int tot = ps[upto];
            if (i > 0) tot -= ps[i-1];
            if (tot != 0) continue;
            bool pos = false;
            for (int j = upto + 2; j <= n + 1; j++) {
                if (dp[j][curr+1]) {
                    pos = true;
                    break;
                }
                if (s[j] == 'X') break;
            }
            dp[i][curr] = pos;
        }
    }
    for (int i = 0; i <= n+1; i++) {
        if (dp[i][0]) return true;
        if (s[i] == 'X') return false;
    }
    return false;
}

std::string solve_puzzle(std::string s, std::vector<int> c) {
    int n = s.size();
    int k = c.size();
    string ans = s;
    for (int i = 0; i < n; i++) {
        if (s[i] != '.') continue;
        bool posX = false, pos_ = false;
        s[i] = 'X';
        if (pos(s, c)) posX = true;
        s[i] = '_';
        if (pos(s, c)) pos_ = true;
        if (posX && pos_) ans[i] = '?';
        else if (posX) ans[i] = 'X';
        else ans[i] = '_'; 
        s[i] = '.';
    }
    return ans;
}
/*
int main() {
    string s; cin >> s;
    int k; cin >> k;
    vector<int> c(k);
    for (int i = 0; i < k; i++) cin >> c[i];
    cout << solve_puzzle(s, c) << "\n";
}*/

Compilation message (stderr)

paint.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~
paint_c.h:1:9: warning: #pragma once in main file
    1 | #pragma once
      |         ^~~~

• Subtask 1: 7 / 7
• Subtask 2: 3 / 3
• Subtask 3: 22 / 22
• Subtask 4: 0 / 27
• Subtask 5: 0 / 21
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10