제출 #732758

#제출 시각아이디문제언어결과실행 시간메모리
732758Trisanu_DasPaint By Numbers (IOI16_paint)C++17
100 / 100
373 ms43216 KiB
#include "paint.h" #include <bits/stdc++.h> using namespace std; const int mxN=2e5, mxK=100; int n, k, a[mxN+1], b1[mxN], b2[mxN+1]; bool dp1[mxN+1][mxK+1], dp2[mxN+1][mxK+1]; string solve_puzzle(string s, vector<int> c) { 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(int i=0; i<n; ++i) { for(int 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'&&a[i+c[j]]==a[i]) dp1[i+c[j]+1][j+1]|=dp1[i][j]; } } for(int i=n; i; --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'&&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]; s[i]=(b1[i]&&b2[i]?'?':b1[i]?'_':'X'); } return s; }
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