Submission #217297

#TimeUsernameProblemLanguageResultExecution timeMemory
217297pit4hLamps (JOI19_lamps)C++14
0 / 100
1108 ms254916 KiB
#include<bits/stdc++.h> using namespace std; const int N = 1e6+1; int dp[N][4][4][4], min_dp[N]; int main() { ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); int n; string s, t; cin>>n>>s>>t; for(int i=0; i<=n; ++i) { for(int a=0; a<=3; ++a) { for(int b=0; b<=3; ++b) { for(int c=0; c<=3; ++c) { dp[i][a][b][c] = n; } } } } dp[0][0][0][0]=0; for(int i=1; i<=n; ++i) { int v1 = n; for(int a=0; a<=3; ++a) { for(int b=0; b<=3; ++b) { for(int c=0; c<=3; ++c) { v1 = min(v1, dp[i-1][a][b][c]); } } } if(s[i-1]==t[i-1]) { dp[i][0][0][0] = v1; } for(int a=1; a<=3; ++a) { int v2 = n; for(int j=0; j<=3; ++j) { for(int k=0; k<=3; ++k) { for(int l=0; l<=3; ++l) { if(j==a || k==a || l==a) { v2 = min(v2, dp[i-1][j][k][l]); } } } } if((a==1 && t[i-1]=='0') || (a==2 && t[i-1]=='1') || (a==3 && s[i-1]!=t[i-1])) { dp[i][a][0][0] = min(v1+1, v2); } for(int b=1; b<=3; ++b) { if(b==a) continue; int v3 = n; for(int j=0; j<=3; ++j) { for(int k=0; k<=3; ++k) { for(int l=0; l<=3; ++l) { if((j==a && k==b) || (k==a && l==b)) { v3 = min(v3, dp[i-1][j][k][l]); } } } } if((a==1 && t[i-1]=='0') || (a==2 && t[i-1]=='1') || (a==3 && ((b==1 && t[i-1]=='1') || (b==2 && t[i-1]=='0')))) { dp[i][a][b][0] = min(v1+2, min(v2+1, v3)); } else { continue; } for(int c=1; c<=3; ++c) { if(c==a || c==b) continue; int v4 = dp[i-1][a][b][c]; dp[i][a][b][c] = min(v1+3, min(v2+2, min(v3+1, v4))); } } } } int ans = n; for(int a=0; a<=3; ++a) { for(int b=0; b<=3; ++b) { for(int c=0; c<=3; ++c) { ans = min(ans, dp[n][a][b][c]); } } } cout<<ans; }
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