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Sky Inc, Programming Contest 2023(AtCoder Beginner Contest 289)E

时间:2023-02-14 20:23:52浏览次数:63  
标签:AtCoder Beginner Contest int nx ny 2010 dp

E - Swap Places

题链
考虑dp[i][j]表示第一个点到达i点 第二个点到达j点的min
然后bfs即可 时间复杂度为状态数

int dp[2010][2010],n,m,c[2010];//dp[i][j]表示到达(i,j)的min
vector<int>g[2010];
void solve(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        cin>>c[i];
        g[i].clear();
    }
    for(int i=1;i<=m;i++){
        int u,v;cin>>u>>v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    for(int i=0;i<=n;i++){
        for(int j=0;j<=n;j++){
            dp[i][j]=INF;
        }
    }
    queue<PII>q;
    dp[1][n]=0;
    q.push({1,n});
    while(q.size()){
        auto [x,y]=q.front();q.pop();
        for(auto nx:g[x]){
            for(auto ny:g[y]){
                if(dp[nx][ny]>dp[x][y]+1&&c[nx]!=c[ny]){
                    dp[nx][ny]=min(dp[nx][ny],dp[x][y]+(c[nx]!=c[ny]));
                    q.push({nx,ny});
                }
            }
        }
    }
    if(dp[n][1]==INF)cout<<-1<<endl;
    else cout<<dp[n][1]<<endl;
}

标签:AtCoder,Beginner,Contest,int,nx,ny,2010,dp
From: https://www.cnblogs.com/ycllz/p/17120778.html

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