Submission #823218

#	Time	Username	Problem	Language	Result	Execution time	Memory
823218		Alihan_8	Paint By Numbers (IOI16_paint)	C++17	80 / 100	2057 ms	1340 KiB

paint

#include <bits/stdc++.h>

using namespace std;

#define all(x) x.begin(), x.end()
#define pb push_back
#define ln '\n'
//#define int long long

template <class _T>
bool chmin(_T &x, const _T &y){
    bool flag = false;
    if ( x > y ){
        x = y; flag |= true;
    }
    return flag;
}

template <class _T>
bool chmax(_T &x, const _T &y){
    bool flag = false;
    if ( x < y ){
        x = y; flag |= true;
    }
    return flag;
}

string solve_puzzle(string s, vector<int> c) {
    int n = (int)s.size(), m = (int)c.size();
    auto ok = [&](string s){
        vector <vector<int>> dp(n + 1, vector <int> (m + 1));
        dp[0][0] = true;
        vector <int> pf(n + 1);
        for ( int i = 0; i < n; i++ ){
            pf[i + 1] = pf[i] + (s[i] == '_');
        }
        auto get = [&](int l, int r){
            return pf[r] - pf[l - 1];
        };
        s = '#' + s;
        for ( int i = 1; i <= n; i++ ){
            for ( int j = 0; j <= m; j++ ){
                if ( s[i] != 'X' ){
                    dp[i][j] |= dp[i - 1][j];
                }
                if ( !j ) continue;
                int k = i - c[j - 1];
                if ( k >= 0 && !get(k + 1, i) ){
                    if ( !k and j <= 1 ){
                        dp[i][j] = true;
                    } else if ( k and s[k] != 'X' ){
                        dp[i][j] |= dp[k - 1][j - 1];
                    }
                }
            }
        }
        return dp[n][m];
    };
    string ans = s;
    for ( int i = 0; i < n; i++ ){
        if ( s[i] != '.' ){
            continue;
        }
        for ( auto j: {'_', 'X'} ){
            s[i] = j;
            if ( ok(s) ){
                if ( ans[i] != '.' ){
                    ans[i] = '?';
                } else ans[i] = j;
            }
        }
        s[i] = '.';
    }
    return ans;
}

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