제출 #130510

#제출 시각아이디문제언어결과실행 시간메모리
130510win11905Paint By Numbers (IOI16_paint)C++11
100 / 100
204 ms24388 KiB
#include "paint.h" #include <bits/stdc++.h> using namespace std; const int N = 2e5+5; int n, k; int pref_[N], prefX[N]; int canX[N], can_[N]; bool state[105][N]; char arr[N]; int sz[N]; string solve_puzzle(string s, vector<int> C) { n = s.size(), k = C.size(); for(int i = 0; i < n; ++i) arr[i+2] = s[i]; for(int i = 0; i < k; ++i) sz[i+1] = C[i]; for(int i = 2; i <= n+1; ++i) pref_[i] = pref_[i-1] + (arr[i] == '_' ? 1 : 0); for(int i = 2; i <= n+1; ++i) prefX[i] = prefX[i-1] + (arr[i] == 'X' ? 1 : 0); pref_[n+2] = pref_[n+1], prefX[n+2] = prefX[n+1]; state[0][0] = 1; for(int i = 1; i <= k; ++i) { int lst = -1; for(int j = sz[i]+1; j <= n+1; ++j) { if(state[i-1][j-sz[i]-1]) lst = j-sz[i]-1; if(lst != -1 && (prefX[j-sz[i]] - prefX[lst] == 0) && (pref_[j] - pref_[j-sz[i]] == 0) && (prefX[(i == k ? n : j) + 1] - prefX[j] == 0)) state[i][j] = 1; } } for(int i = k; i >= 0; --i) { if(i == k) for(int j = n+1; j >= 0; --j) { if(state[i][j]) { canX[j-sz[i]+1]++, canX[j+1]--, can_[j+1]++, can_[n+2]--; } } else { int l = n+1, r = n+1; while(true) { if(state[i+1][r]) { if(r-l <= sz[i+1]) state[i][l--] = false; else if(state[i][l]) { if(prefX[r-sz[i+1]] - prefX[l] == 0) canX[l-sz[i]+1]++, canX[l+1]--, can_[l+1]++, can_[r-sz[i+1]+1]--, l--; else r--; } else l--; } else r--; if(l < 0 || r < 0) break; } for(int j = l; j >= 0; --j) state[i][j] = false; } } for(int j = 2; j <= n+1; ++j) canX[j] += canX[j-1], can_[j] += can_[j-1]; string str; for(int j = 2; j <= n+1; ++j) { if(canX[j] && can_[j]) str.push_back('?'); else if(canX[j]) str.push_back('X'); else str.push_back('_'); } return str; }
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