QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#114502#4437. Link with RunningLiufWA 726ms92628kbC++202.8kb2023-06-22 12:22:592023-06-22 12:23:00

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-06-22 12:23:00]
  • 评测
  • 测评结果:WA
  • 用时:726ms
  • 内存:92628kb
  • [2023-06-22 12:22:59]
  • 提交

answer

#include<bits/stdc++.h>

#define endl '\n'
#define pii pair<int, int>
#define int long long

using namespace std;

const int N=100010;

int n,m;

struct node{
    int v,e,p;
};

vector<node>g[N],e1[N],e2[N];

int dis[N];

void dijkstra(){
    priority_queue<pii,vector<pii>,greater<pii>>q;
    for(int i=2;i<=n;i++){
        dis[i]=1e18;
    }

    vector<int>vis(n+1,0);

    q.push({0,1});
    while(q.size()){
        auto [distance,u]=q.top();
        q.pop();
        if(vis[u])continue;
        vis[u]=1;
        for(auto [v,e,p]:g[u]){
            if(dis[v]>dis[u]+e){
                dis[v]=dis[u]+e;  
                q.push({dis[v],v});
            }
        }
    }

    for(int i=1;i<=n;i++){
        if(dis[i]==1e18)continue;
        for(auto [v,e,p]:g[i]){
            if(dis[v]==dis[i]+e){
                e1[i].push_back({v,e,p});
            }
        }
    }
}

int dfsn[N],low[N],instk[N],scc[N],cnt,cscc,deg[N];

void tarjan(int u){
    stack<int>stk;
    low[u]=dfsn[u]=++cnt;
    instk[u]=1;
    stk.push(u);//进栈
    for(auto [v,e,p]:e1[u]){
        if(!dfsn[v]){//未访问过
            tarjan(v);//递归
            low[u]=min(low[u],low[v]);
        } else if(instk[v]){//访问过,且q可达p
            low[u]=min(low[u],dfsn[v]);
        }
    }

    if(low[u]==dfsn[u]){// 发现强连通分量的根
        int top;
        cscc++;
        do{
            top=stk.top();
            stk.pop();
            instk[top]=0;
            scc[top]=cscc;// 记录所属的强连通分量
        } while(top!=u);// 直到弹出p才停止
    }
}

void solve(){
    cin>>n>>m;

    cscc=cnt=0;
    for(int i=1;i<=n;i++){
        g[i].clear();
        e1[i].clear();
        e2[i].clear();
        dfsn[i]=instk[i]=deg[i]=low[i]=scc[i]=0;
    }

    for(int i=1;i<=m;i++){
        int u,v,e,p;
        cin>>u>>v>>e>>p;
        g[u].push_back({v,e,p});
    }

    dijkstra();

    for(int i=1;i<=n;i++){
        if(!dfsn[i]){
            tarjan(i);
        }
    }

    for(int u=1;u<=n;u++){
        for(auto [v,e,p]:e1[u]){
            int a=scc[u],b=scc[v];
            if(a!=b){
                deg[b]++;
                e2[a].push_back({b,e,p});
            }
        }
    }

    vector<int>dp(n+1,0);
    queue<int>q;
    q.push(scc[1]);
    while(q.size()){
        auto u=q.front();q.pop();
        for(auto [v,e,p]:e2[u]){
            dp[v]=max(dp[v],dp[u]+p);
            if(--deg[v]==0){
                q.push(v);
            }
        }
    }

    cout<<dis[n]<<' '<<dp[scc[n]]<<endl;
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int t;
    cin>>t;

    while(t--){
        solve();
    }

    
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 0
Wrong Answer
time: 726ms
memory: 92628kb

input:

12
100000 200000
1 2 838279516 902819511
1 3 293478832 513256010
2 4 682688353 204481674
2 5 360092507 651108247
5 6 519851939 323803002
6 7 675439277 205804465
7 8 419167205 386168059
6 9 140767493 382483305
9 10 558115401 613738466
9 11 902235661 744659643
9 12 851394758 1720015
12 13 635355827 46...

output:

5927443549 11285847934
2529348 325344428756
2522027 438209666288
250100947 25049026205784
249512452 24966236662852
0 913303795
0 654328832
0 1000000000
0 1
0 0
0 1
0 1

result:

wrong answer 6th lines differ - expected: '0 9535132634', found: '0 913303795'