제출 #998612

#제출 시각아이디문제언어결과실행 시간메모리
998612hasan2006Paint By Numbers (IOI16_paint)C++17
100 / 100
236 ms49500 KiB
#include <bits/stdc++.h> #include "paint.h" using namespace std; #define all(s) s.begin(),s.end() #define pb push_back #define ll long long const int N = 2e5 + 17, K = 100 + 17; int a[N], b1[N], b2[N]; bool dp1[N][K], dp2[N][K]; string solve_puzzle(string s, vector<int> c) { int i , j , n = s.size() , k = c.size(); for(int i = 0; i < n; i++) a[i + 1] = a[i] + (s[i] == '_'); dp1[0][0] = dp2[n][k] = 1; for(i = 0; i < n; i++){ for(j = 0; j <= k; j++){ if(s[i] != 'X') dp1[i + 1][j] |= dp1[i][j]; if(j < k && i + c[j] < n && s[i + c[j]]^'X') if(a[i + c[j]] == a[i]) dp1[i+c[j]+1][j+1] |= dp1[i][j]; } } for(int i = n; i > 0; i--) { for(int j = 0; j <= k; j++) { if(s[i - 1] != 'X') dp2[i - 1][j] |= dp2[i][j]; if(j && i - c[j - 1] > 0 && s[i - c[j - 1] - 1] ^ 'X') if(a[i] == a[i - c[j - 1]]) dp2[i - c[j - 1] - 1][j - 1] |= dp2[i][j]; } } for(int i = 0; i < n; i++) { for(int j = 0; j <= k; j++) b1[i] |= dp1[i + 1][j] && dp2[i][j]; for(int j = 0; j < k; j++) { if(i + c[j] <= n && dp1[i][j] && dp2[i + c[j]][j + 1] && a[i + c[j]] == a[i]) { b2[i]++; b2[i + c[j]]--; } } b2[i + 1] += b2[i]; if(b1[i] && b2[i]) s[i] = '?'; else if(b1[i]) s[i] = '_'; else s[i] = 'X'; } return s; }
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