Submission #69146

#	Time	Username	Problem	Language	Result	Execution time	Memory
69146		red1108	물탱크 (KOI18_watertank)	C++17	100 / 100	1240 ms	207564 KiB

watertank

#include <bits/stdc++.h>
using namespace std;
int dis[1000010];
vector<pair<int,int> > graph[1000010];
priority_queue<pair<int,int> > pq;
int n, m, h;
bool visit[1000100];
int main()
{
    int i, j, ina, st,from,to;
    scanf("%d %d %d", &n,&m,&h);
    st=n*m+1;
    for(i=1;i<=n+1;i++)
    {
        for(j=1;j<=m;j++)
        {
            scanf("%d", &ina);
            if(ina==-1) ina=h;
            from=(i-2)*m+j;
            to=(i-1)*m+j;
            if(from<1||from>n*m) from=st;
            if(to<1||to>n*m) to=st;
            graph[from].push_back({ina,to});
            graph[to].push_back({ina,from});
        }
    }
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=m+1;j++)
        {
            scanf("%d", &ina);
            if(ina==-1) ina=h;
            from=(i-1)*m+j-1;
            to=(i-1)*m+j;
            if(j==1) from=st;
            if(j==m+1) to=st;
            graph[from].push_back({ina,to});
            graph[to].push_back({ina,from});
        }
    }
    visit[st]=1;
    pq.push({0,st});
    while(!pq.empty())
    {
        int cur=pq.top().second;
        if((-1)*pq.top().first>dis[cur]){pq.pop();continue;}
        pq.pop();
        for(auto i:graph[cur])
        {
            if(!visit[i.second]||dis[i.second]>max(dis[cur],i.first))
            {
                dis[i.second]=max(dis[cur],i.first);
                visit[i.second]=1;
                pq.push({-dis[i.second],i.second});
            }
        }
    }
    long long ans=0;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=m;j++)
        {
            ans=ans+dis[(i-1)*m+j];
        }
    }
    printf("%lld", ans);
}

Compilation message (stderr)

watertank.cpp: In function 'int main()':
watertank.cpp:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &n,&m,&h);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
watertank.cpp:17:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &ina);
             ~~~~~^~~~~~~~~~~~
watertank.cpp:31:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d", &ina);
             ~~~~~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 18 / 18
• Subtask 3: 15 / 15
• Subtask 4: 21 / 21
• Subtask 5: 40 / 40