제출 #246856

#제출 시각아이디문제언어결과실행 시간메모리
246856kshitij_sodani여행하는 상인 (APIO17_merchant)C++14
100 / 100
90 ms4344 KiB
#include <bits/stdc++.h> using namespace std; typedef int64_t llo; #define mp make_pair #define pb push_back #define a first #define b second //#define endl '\n' llo n,m,k; llo dist[101][101]; llo dist2[101][101]; llo min2(llo aa,llo bb){ if(aa==-1){ return bb; } else if(bb==-1){ return aa; } return min(aa,bb); } llo cost[101][1000][2]; llo cost2[101][101]; vector<pair<pair<llo,llo>,llo>> ed; //vector<pair<pair<llo,llo>,llo>> ed2; //llo vis[101][101]; bool check(llo mid){ if(mid==0){ return true; } for(llo i=0;i<n;i++){ for(llo j=0;j<n;j++){ dist2[i][j]=min((llo)(LLONG_MAX/2/mid),dist[i][j])*mid-cost2[i][j]; } } /*for(auto j:ed){ dist2[j.a.a][j.a.b]=min((llo)(LLONG_MAX/mid/2),dist[j.a.a][j.a.b])*mid-j.b; }*/ for(llo kk=0;kk<n;kk++){ for(llo i=0;i<n;i++){ for(llo j=0;j<n;j++){ dist2[i][j]=min(dist2[i][j],dist2[i][kk]+dist2[kk][j]); } } } for(llo i=0;i<n;i++){ if(dist2[i][i]<=0){ return true; } continue; } return false; } int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cin>>n>>m>>k; for(llo i=0;i<n;i++){ for(llo j=0;j<n;j++){ dist[i][j]=1e18; } } for(llo i=0;i<n;i++){ for(llo j=0;j<k;j++){ cin>>cost[i][j][0]>>cost[i][j][1]; } } for(llo i=0;i<m;i++){ llo aa,bb,cc; cin>>aa>>bb>>cc; dist[aa-1][bb-1]=cc; } for(llo kk=0;kk<n;kk++){ for(llo i=0;i<n;i++){ for(llo j=0;j<n;j++){ dist[i][j]=min(dist[i][j],dist[i][kk]+dist[kk][j]); } } } for(llo i=0;i<n;i++){ for(llo j=0;j<n;j++){ if(i==j){ continue; } llo xx=0; for(llo kk=0;kk<k;kk++){ if(cost[i][kk][0]==-1 or cost[j][kk][1]==-1){ continue; } xx=max(xx,-cost[i][kk][0]+cost[j][kk][1]); } cost2[i][j]=xx; // ed.pb({{i,j},xx}); } } llo low=0; llo high=1e9; while(low<high-1){ llo mid=(low+high)/2; if(check(mid)){ low=mid; } else{ high=mid; } } for(llo i=high;i>=low;i--){ if(check(i)){ cout<<i<<endl; return 0; } } return 0; }
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