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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int a[51][51];
  4. int dist[51][51];
  5. int n;
  6. bool check(int x,int y){
  7.     return x>=0 && x < n && y>=0 && y < n;
  8. }
  9. void dijkstra(){
  10.     priority_queue<pair<int,pair<int ,int>>,vector<pair<int,pair<int,int>>>,greater<pair<int,pair<int,int>>>>pq;
  11.     pq.push({a[0][0],{0,0}});
  12.     dist[0][0]=a[0][0];
  13.     while(!pq.empty()){
  14.        auto temp = pq.top();
  15.        pq.pop();
  16.        int u = temp.second.first;
  17.        int v = temp.second.second;
  18.        if(check(u+1,v) && dist[u][v]+a[u+1][v]<dist[u+1][v])dist[u+1][v]=dist[u][v]+a[u+1][v],pq.push({dist[u+1][v],{u+1,v}});
  19.        if(check(u,v+1) && dist[u][v]+a[u][v+1]<dist[u][v+1])dist[u][v+1]=dist[u][v]+a[u][v+1],pq.push({dist[u][v+1],{u,v+1}});
  20.        if(check(u-1,v) && dist[u][v]+a[u-1][v]<dist[u-1][v])dist[u-1][v]=dist[u][v]+a[u-1][v],pq.push({dist[u-1][v],{u-1,v}});
  21.        if(check(u,v-1) && dist[u][v]+a[u][v-1]<dist[u][v-1])dist[u][v-1]=dist[u][v]+a[u][v-1],pq.push({dist[u][v-1],{u,v-1}});
  22.  
  23.     }
  24.  
  25.  
  26. }
  27. int main(){
  28.     int t;
  29.     cin>>t;
  30.     while(t--){
  31.        // int n;
  32.         cin>>n;
  33.         for(int i=0;i<n;i++){
  34.             for(int j=0;j<n;j++)
  35.                 cin>>a[i][j];
  36.         }
  37.         for(int i=0;i<n;i++)
  38.             for(int j=0;j<n;j++)
  39.               dist[i][j]=INT_MAX;
  40.         dijkstra();
  41.         cout<<dist[n-1][n-1]<<endl;      
  42.     }
  43.  
  44. }
  45.  
Success #stdin #stdout 0.03s 15256KB
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https://ideone.com/tvKC9r
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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