Submission #118979

#	Time	Username	Problem	Language	Result	Execution time	Memory
118979		turbat	Paint By Numbers (IOI16_paint)	C++14	59 / 100	137 ms	82680 KiB

paint

    #include "paint.h"
    #include <bits/stdc++.h>
    using namespace std;
    #define N 200005
     
    int n, k, cntw[N], cntb[N], cnt[105], canw[N], canb[N];
    vector <int> c;
    string s, ans;
    int dp[N][105], paint[N][105];
     
    int solve(int idx, int col){
    	if (col == -1 && !cntb[idx]) return 1;
    	if (col == -1 && cntb[idx]) return 0;
    	if (idx < 2) return 0;
    	if (dp[idx][col] != -1) return dp[idx][col];
    	dp[idx][col] = 0;
    	if (s[idx] == '_' || s[idx] == '.') dp[idx][col] = solve(idx - 1, col);
    	if (s[idx] == 'X' || s[idx] == '.')
    		if (idx - c[col] > 0 && cntw[idx] - cntw[idx - c[col]] == 0 && s[idx - c[col]] != 'X')
    			if (solve(idx - c[col] - 1, col - 1)){
    				dp[idx][col] = 1;
    				paint[idx][col]++;
    				cnt[col]++;
    				paint[idx - c[col]][col]--;
    			}
    	return dp[idx][col];
    }
     
    string solve_puzzle(string ss, vector<int> cc) {
    	s = ss;
    	c = cc;
    	s = "__" + s;
    	n = s.size();
    	k = c.size();
    	for (int i = 1;i < n;i++){
    		if (s[i] == '_') cntw[i]++;
    		cntw[i] += cntw[i - 1];
    		if (s[i] == 'X') cntb[i]++;
    		cntb[i] += cntb[i - 1];
    	}
    	memset(dp, -1, sizeof dp);
    	solve(n - 1, k - 1);
    	for (int i = 0;i < k;i++){
    		// cout << cnt[i]<< endl;
    		int sum = 0;
    		for (int j = n - 1;j > 1;j--){
    			// cout << paint[j][i]<< ' ';
    			sum += paint[j][i];
    			// cout << sum << ' ';
    			if (!sum) canw[j]++;
    			if (sum == cnt[i]) canb[j] = 1;
    		}
    		// cout << endl;
    	}
    	for (int i = 2;i < n;i++){
    		if (canw[i] == k) ans += '_';
    		else if (canb[i] || s[i] == 'X') ans += 'X';
    		else ans += '?';
    	}
        return ans;
    }

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