Submission #363970

#TimeUsernameProblemLanguageResultExecution timeMemory
363970bigDuckTravelling Merchant (APIO17_merchant)C++14
33 / 100
64 ms3180 KiB
#include<bits/stdc++.h> using namespace std; #define INIT ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); #define mp make_pair #define pb push_back #define ft first #define sc second #define ll long long #define pii pair<int, int> #define count_bits __builtin_popcount #define int ll int t, n, m, k, a[300010], q, l, r; int b[101][1001], s[101][1001]; int c[101][101]; int d[101][101]; int p[101][101]; vector<pii> g[101]; void dijkstra(int s){ multiset<pii> ms; ms.insert({0, s}); d[s][s]=0; bool v[101]; memset(v, 0, sizeof(v)); while(!ms.empty()){ int nod=(ms.begin())->sc; ms.erase(ms.begin()); v[nod]=true; for(pii pr:g[nod]){ int u=pr.ft, c=pr.sc; if(v[u]){continue;} auto it=ms.find({d[s][u], u}); if(it==ms.end()){ d[s][u]=d[s][nod]+c; ms.insert({d[s][u], u}); } else{ if(d[s][u]>(d[s][nod]+c) ){ ms.erase(it); d[s][u]=d[s][nod]+c; ms.insert({d[s][u], u}); } } } } } int g1[101][101]; int inf=(1e18)*2; void build(int r){ for(int i=1; i<=n; i++){ for(int j=1; j<=n; j++){ g1[i][j]=inf; } } for(int i=1; i<=n; i++){ g1[i][i]=0; } for(int i=1; i<=n; i++){ for(int j=1; j<=n;j++){ if(c[i][j]>0){ if( (c[i][j]>d[i][j]) && (d[i][j]>0) ){c[i][j]=min(d[i][j], c[i][j]);} g1[i][j]=r*c[i][j]-p[i][j]; } } } } vector<int> g2[101]; int v2[101]; bool dfs(int s){ v2[s]=1; bool b=false; for(int u:g2[s]){ if(v2[u]==1){ v2[s]=-1; return true;} if(v2[u]==-1){continue;} b=(b||dfs(u)); } v2[s]=-1; return b; } bool BellmanFord(int r){ build(r); for(int k=1; k<=n; k++){ for(int i=1; i<=n; i++){ for(int j=1; j<=n; j++){ g1[i][j]=min(g1[i][j], g1[i][k]+g1[k][j]); } } } bool exists=false; for(int i=1; i<=n; i++){ for(int j=1; j<=n; j++){ if(j!=i){ if( (g1[i][j]+g1[j][i])<=g1[i][i] ){ exists=true; } } } } return exists; } int32_t main(){ INIT cin>>n>>m>>k; for(int i=1; i<=n; i++){ for(int j=1; j<=k; j++){ cin>>b[i][j]>>s[i][j]; } } for(int i=1; i<=m; i++){ int u, v, C; cin>>u>>v>>C; c[u][v]=C; g[u].pb({v, C}); } for(int i=1;i<=n; i++){ dijkstra(i); } for(int i=1; i<=n; i++){ for(int j=1; j<=n; j++){ //p[i][j]=-1; if(c[i][j]>0){ for(int l=1; l<=k; l++){ if( (s[j][l]>=0) && (b[i][l]>=0) ){ p[i][j]=max(p[i][j], s[j][l]-b[i][l]); } } } } } int l=1, r=1000000001, m=(l+r)>>1ll; while(l<r){ m=(l+r)>>1ll; if(BellmanFord(m)){ l=m+1; } else{ r=m; } m=(l+r)>>1ll; } cout<<(m-1); //cout<<BellmanFord(m)<<"\n"; return 0; }
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