제출 #1078049

#제출 시각아이디문제언어결과실행 시간메모리
1078049juicyPaint By Numbers (IOI16_paint)C++17
100 / 100
197 ms44260 KiB
#include "paint.h" #include <bits/stdc++.h> namespace { const int N = 2e5 + 5, K = 105; int a[N], pf[N]; bool p[N][K], s[N][K], b[N]; std::string solve(const std::string &S, const std::vector<int> c) { int n = S.size(), k = c.size(); for (int i = 0; i < n; ++i) { pf[i + 1] = pf[i] + (S[i] == '_'); } p[0][0] = 1; for (int i = 0; i < n; ++i) { for (int j = 0; j <= k; ++j) { if (!p[i][j]) { continue; } if (S[i] != 'X') { p[i + 1][j] = 1; } if (j < k) { int l = c[j]; if (i + l < n && S[i + l] != 'X' && pf[i + l] - pf[i] == 0) { p[i + l + 1][j + 1] = 1; } } } } s[n + 1][k + 1] = 1; for (int i = n + 1; i > 1; --i) { for (int j = 1; j <= k + 1; ++j) { if (!s[i][j]) { continue; } if (S[i - 2] != 'X') { s[i - 1][j] = 1; } if (j > 1) { int l = c[j - 2]; if (i - l > 1 && S[i - l - 2] != 'X' && pf[i - 1] - pf[i - l - 1] == 0) { s[i - l - 1][j - 1] = 1; } } } } for (int i = 1; i <= n; ++i) { for (int j = 0; j <= k; ++j) { b[i] |= p[i][j] && s[i][j + 1]; if (j < k && i + c[j] - 1 <= n && p[i - 1][j] && s[i + c[j]][j + 2] && pf[i + c[j] - 1] - pf[i - 1] == 0) { ++a[i]; --a[i + c[j]]; } } } std::string res(n, '?'); for (int i = 1; i <= n; ++i) { a[i] += a[i - 1]; if (!b[i]) { res[i - 1] = 'X'; } if (!a[i]) { res[i - 1] = '_'; } } return res; } } std::string solve_puzzle(std::string s, std::vector<int> c) { return solve(s, c); }
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