oj.uz

Submission #29479

# Submission time Handle Problem Language Result Execution time Memory
29479 2017-07-19T13:04:06 Z samir_droubi Sightseeing (NOI14_sightseeing) C++14
15 / 25
 3500 ms 110836 KB 
#include <bits/stdc++.h>
using namespace std;
int n,m,q;
const int mxn=(5e5)+5;
vector<pair<int,int> >gr[mxn];
int ans[mxn];
int mn=(1e9);
vector<int>e[mxn];
queue<int>qq;
void bfs()
{
    while(!qq.empty())
    {
        int v=qq.front();
        qq.pop();
        for(int i=0;i<gr[v].size();++i)
        {
            int u=gr[v][i].first;
            int w=gr[v][i].second;
            if(ans[u]!=-1)continue;
            if(w>=mn)ans[u]=mn,qq.push(u);
            else e[w].push_back(u);
        }
    }
}
int main()
{
    scanf("%d%d%d",&n,&m,&q);
    for(int i=0;i<m;++i)
    {
        int x,y,w;
        scanf("%d%d%d",&x,&y,&w);
        gr[x].push_back({y,w});
        gr[y].push_back({x,w});
    }
    memset(ans,-1,sizeof ans);

    ans[1]=(1e9);
    qq.push(1);
    bfs();

    for(int i=(1e5);i>=0;--i)
    {
        mn=i;
        for(int j=0;j<e[i].size();++j)
        {
            int v=e[i][j];
            if(ans[v]!=-1)continue;
            ans[v]=i;
            qq.push(v);
        }
        bfs();
    }
    while(q--)
    {
        int x;
        scanf("%d",&x);
        printf("%d\n",ans[x]);
    }
    return 0;
}

Compilation message

sightseeing.cpp: In function 'void bfs()':
sightseeing.cpp:16:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<gr[v].size();++i)
                      ^
sightseeing.cpp: In function 'int main()':
sightseeing.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int j=0;j<e[i].size();++j)
                      ^
sightseeing.cpp:28:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&m,&q);
                             ^
sightseeing.cpp:32:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&x,&y,&w);
                                 ^
sightseeing.cpp:57:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&x);
                       ^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 27412 KB Output is correct
2 Correct 3 ms 27412 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 27676 KB Output is correct
2 Correct 6 ms 27544 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 43 ms 29656 KB Output is correct
2 Correct 46 ms 29260 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3500 ms 110836 KB Execution timed out
2 Halted 0 ms 0 KB -