제출 #592814

#제출 시각아이디문제언어결과실행 시간메모리
592814jasminPaint By Numbers (IOI16_paint)C++14
100 / 100
771 ms99108 KiB
#include<bits/stdc++.h> #include<paint.h> using namespace std; void make_dp_front(string& s, vector<int>& c, vector<vector<array<bool, 2> > >& dp){ int n=s.size(); int k=c.size(); vector<int> lastwhite(n); int last=-10; for(int i=0; i<n; i++){ if(s[i]=='_'){ last=i; } lastwhite[i]=last; } dp[0][0][0]=true; for(int i=1; i<=n; i++){ for(int j=0; j<=k; j++){ if(s[i-1]=='_'){//white dp[i][j][0]=dp[i-1][j][0] || dp[i-1][j][1]; dp[i][j][1]=false; } else if(s[i-1]=='X'){ //black dp[i][j][0]=false; if(0<j && 0<=i-c[j-1] && lastwhite[i-1]+1<=i-c[j-1]){ dp[i][j][1]=dp[i-c[j-1]][j-1][0]; } } else{ dp[i][j][0]=dp[i-1][j][0] || dp[i-1][j][1]; if(0<j && 0<=i-c[j-1] && lastwhite[i-1]+1<=i-c[j-1]){ dp[i][j][1]=dp[i-c[j-1]][j-1][0]; } } } } } void make_dp_back(string& s, vector<int>& c, vector<vector<array<bool, 2> > >& dp){ int n=s.size(); int k=c.size(); vector<int> lastwhite(n); int last=n+10; for(int i=n-1; i>=0; i--){ if(s[i]=='_'){ last=i; } lastwhite[i]=last; } dp[n][k][0]=true; for(int i=n-1; i>=0; i--){ for(int j=k; j>=0; j--){ if(s[i]=='_'){//white dp[i][j][0]=dp[i+1][j][0] || dp[i+1][j][1]; dp[i][j][1]=false; } else if(s[i]=='X'){ //black dp[i][j][0]=false; if(j<k && i+c[j]<=n && i+c[j]<=lastwhite[i]){ dp[i][j][1]=dp[i+c[j]][j+1][0]; } } else{ dp[i][j][0]=(dp[i+1][j][0] || dp[i+1][j][1]); if(j<k && i+c[j]<=n && i+c[j]<=lastwhite[i]){ dp[i][j][1]=dp[i+c[j]][j+1][0]; } } } } } string solve_puzzle(string s, vector<int> c){ int n=s.size(); int k=c.size(); vector<vector<array<bool, 2> > > dp_front(n+1, vector<array<bool, 2> > (k+1)); make_dp_front(s, c, dp_front); vector<vector<array<bool, 2> > > dp_back(n+1, vector<array<bool, 2> > (k+1)); make_dp_back(s, c, dp_back); vector<int> lastwhite(n+1); int last=-10; for(int i=0; i<=n; i++){ lastwhite[i]=last; if(i<n && s[i]=='_'){ last=i; } } vector<bool> black(n); vector<bool> white(n); for(int j=0; j<k; j++){ int start=0; for(int l=0, r=c[j]; r<=n; l++, r++){ bool ok=(lastwhite[r]<l); if(ok && dp_front[l][j][0] && dp_back[r][j+1][0]){ start=max(start, l); for(int i=start; i<r; i++){ black[i]=true; } start=r; } } } lastwhite.clear(); for(int j=0; j<=k; j++){ for(int i=0; i<n; i++){ if((dp_front[i][j][0] || dp_front[i][j][1]) && (dp_back[i+1][j][0] || dp_back[i+1][j][1])){ white[i]=true; } } } string ans=s; for(int i=0; i<n; i++){ assert(black[i] || white[i]); if(s[i]=='_' || !black[i]){ ans[i]='_'; } else if(s[i]=='X' || !white[i]){ ans[i]='X'; } else{ ans[i]='?'; } } return ans; }
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