제출 #773401

#제출 시각아이디문제언어결과실행 시간메모리
773401PoonYaPatPaint By Numbers (IOI16_paint)C++14
59 / 100
1 ms384 KiB
#include "paint.h" #include <bits/stdc++.h> using namespace std; int n,m,bef[200001],aft[200001],mark[200001]; bool dp1[200001][101],dp2[200001][101]; bool canX[200001],canY[200001]; string ans; string solve_puzzle(string s, vector<int> c) { n=s.size(); m=c.size(); int before=-1,after=n; for (int i=0; i<n; ++i) { if (s[i]=='_') before=i; bef[i]=before; } for (int i=n-1; i>=0; --i) { if (s[i]=='_') after=i; aft[i]=after; } for (int i=0; i<n; ++i) { for (int j=0; j<m; ++j) { if (i) dp1[i][j]=dp1[i-1][j]; if (i-bef[i]>=c[j] && (j==0 || (i-c[j]-1>=0 && dp1[i-c[j]-1][j-1]))) dp1[i][j]=true; } } for (int i=n-1; i>=0; --i) { for (int j=0; j<m; ++j) { if (i!=n-1) dp2[i][j]=dp2[i+1][j]; if (aft[i]-i>=c[j] && (j==m-1 || (i+c[j]+1<n && dp2[i+c[j]+1][j+1]))) { dp2[i][j]=true; if (j==0 || (i>=2 && dp1[i-2][j-1])) ++mark[i], --mark[i+c[j]]; } } } for (int i=0; i<n; ++i) { mark[i]+=mark[i-1]; if (mark[i]) canX[i]=true; if ((i>=1 && dp1[i-1][m-1]) || (i<=n-2 && dp2[i+1][0])) canY[i]=true; for (int j=0; j<m-1; ++j) { if (i!=0 && i!=n-1 && dp1[i-1][j] && dp2[i+1][j+1]) canY[i]=true; } } for (int i=0; i<n; ++i) { if (s[i]=='X' || s[i]=='_') ans+=s[i]; else { if (canX[i] && canY[i]) ans+='?'; else if (canX[i]) ans+='X'; else ans+='_'; } } return ans; }
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