이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define INF 1e9+7
#define all(x) x.begin(),x.end()
using namespace std;
using namespace __gnu_pbds;
using ll=long long;
using pii=pair<int,int>;
using ppi=pair<int,pii>;
using oset=tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;
template<typename T>
void _print(vector<T> x) {cerr<<"{"; for(auto e:x) cerr<<e<<","; cerr<<"}";}
void _print(pii x) {cerr<<"{"<<x.first<<","<<x.second<<"}";}
template<typename T>
void _print(T x) {cerr<<x;}
void dbg() {cerr<<endl;}
template<typename Head,typename... Tail>
void dbg(Head H,Tail... T) {
_print(H);
if(sizeof...(T)) cerr<<",";
else cerr<<"\"]";
dbg(T...);
}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:[\"",dbg(__VA_ARGS__)
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define buy first
#define sell second
const int mxn=102;
const int mxk=1010;
int n,m,k;
vector<pii> adj[mxn];
int dp[mxk];
pii shop[mxn][mxk];
int dist[mxn];
void dijk() {
memset(dist,INF,sizeof(dist));
priority_queue<pii,vector<pii>,greater<pii>> pq;
vector<bool> flag(n+1,false);
dist[1]=0;
pq.push({0,1});
while(!pq.empty()) {
pii cur=pq.top(); pq.pop();
int d=cur.first,u=cur.second;
flag[u]=true;
for(auto vw:adj[u]) {
int v=vw.first,w=vw.second;
if(!flag[v] and d+w<dist[v]) {
dist[v]=d+w;
pq.push({dist[v],v});
}
}
}
}
int main () {
ios::sync_with_stdio(false); cin.tie(0);
cin>>n>>m>>k;
for(int i=1;i<=n;i++) {
for(int j=1;j<=k;j++) {
cin>>shop[i][j].buy>>shop[i][j].sell;
}
}
for(int i=0;i<m;i++) {
int u,v,w; cin>>u>>v>>w;
adj[u].push_back({v,w});
adj[v].push_back({u,w});
}
dijk();
vector<int> dp_idx(k+1);
int ans=0;
for(int i=2;i<=n;i++) {
for(int j=1;j<=k;j++) {
if(shop[i][j].sell==-1 or shop[1][j].buy==-1) continue;
ans=max(ans,(shop[i][j].sell-shop[1][j].buy)/(2*dist[i]));
}
}
cout<<ans<<endl;
}
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