제출 #296770

#제출 시각아이디문제언어결과실행 시간메모리
296770Haunted_CppPaint By Numbers (IOI16_paint)C++17
10 / 100
293 ms333812 KiB
#include "paint.h" #include <bits/stdc++.h> using namespace std; const int MAX_N = 2e5 + 5; const int MAX_K = 1e2 + 5; int dp[MAX_N][MAX_K][2]; bitset<2> vis[MAX_N][MAX_K]; vector<int> white, black; vector<int> c; string s; int n, K; int range_sum(int lo, int hi) { return white[hi] - (lo - 1 >= 0 ? white[lo - 1] : 0); } int solve(int p, int k, bool can) { if (p >= n) return dp[p][k][can] = (k == K); int &res = dp[p][k][can]; if (~res) return res; res = 0; if (s[p] == '_' || s[p] == '.') { res = max(res, solve(p + 1, k, true)); } if (k < K && can && (s[p] == 'X' || s[p] == '.')) { const int t = c[k]; if (p + t > n) return res; const int cur = range_sum(p, p + t - 1); if (cur == 0) { res = max(res, solve(p + t, k + 1, false)); } } return res; } vector<int> W, B; void backtrack(int p, int k, int can) { if (p >= n) { return; } if (vis[p][k][can]) { return; } vis[p][k][can] = 1; int white_works = 0; if (s[p] == '_' || s[p] == '.') { white_works = solve(p + 1, k, true); } int black_works = 0; if (k < K && can && (s[p] == 'X' || s[p] == '.')) { const int t = c[k]; if (p + t <= n) { const int cur = range_sum(p, p + t - 1); if (cur == 0) { black_works = solve(p + t, k + 1, false); } if (black_works) { ++B[p]; --B[p + t]; //~ cout << "ADD:" << p << ' ' << p + t << '\n'; backtrack(p + t, k + 1, false); } } } //~ assert(white_works || black_works); if (white_works) { //~ cout << p << ' '; W[p] = 1; backtrack(p + 1, k, true); } } string solve_puzzle(string s, vector<int> c) { ::c = c; ::s = s; n = s.size(); K = c.size(); memset(dp, -1, sizeof(dp)); white = black = vector<int>(n); auto work = [&](vector<int>& arr, const char t) { arr[0] = (s[0] == t); for (int i = 1; i < n; i++) { arr[i] = arr[i - 1] + (s[i] == t); } }; work(white, '_'); work(black, 'X'); solve(0, 0, true); W = B = vector<int>(n); backtrack(0, 0, true); string res = string(n, 'z'); int cur = 0; for (int i = 0; i < n; i++) { cur += B[i]; if (cur > 0 && W[i] > 0) { res[i] = '?'; continue; } if (cur > 0) { res[i] = 'X'; continue; } if (W[i] > 0) { res[i] = '_'; continue; } //~ assert(1 == 2); } return res; }
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