#include <bits/stdc++.h>
using namespace std;
#define ldb long double
#define ll long long
#define pb push_back
#define mp make_pair
struct pt{ ll x,y;pt(){}pt(ll a, ll b):x(a),y(b){}};
pt operator - (pt a, pt b){ return pt(a.x-b.x,a.y-b.y);}
struct Edge
{
int u,v,a,b;
Edge(){}
Edge(int _u, int _v, int _a, int _b):u(_u),v(_v),a(_a),b(_b){}
ll Get(ll ma, ll mb){ return mb*a+ma*b;}
};
vector<Edge> edges;
vector<pair<int,int>> tree;
ll ma,mb;
bool comp(Edge x, Edge y)
{
return x.Get(ma,mb)<y.Get(ma,mb);
}
const int N=205;
struct DSU
{
int p[N];
void init(){ for(int i=0;i<N;i++) p[i]=i;}
DSU(){ init();}
int Find(int x){ return x==p[x]?x:p[x]=Find(p[x]);}
void Union(int x, int y){ p[Find(x)]=Find(y);}
} DS;
ll ans=9e18;
ll ans_ma,ans_mb;
pt MST(ll ma, ll mb)
{
DS.init();
tree.clear();
::ma=ma;::mb=mb;
sort(edges.begin(),edges.end(),comp);
ll A=0,B=0;
for(Edge e:edges)
{
if(DS.Find(e.u)!=DS.Find(e.v))
{
DS.Union(e.u,e.v);
A+=e.a;
B+=e.b;
tree.pb({e.u,e.v});
}
}
ans=min(ans,A*B);
if(ans==A*B) ans_ma=ma,ans_mb=mb;
return pt(A,B);
}
ll cross(pt a, pt b){ return a.x*b.y-a.y*b.x;}
void Solve(pt F, pt S)
{
pt M=MST(S.x-F.x,F.y-S.y);
if(cross(F-M,S-M)!=0)
{
Solve(F,M);
Solve(M,S);
}
}
int main()
{
int n,m,u,v,a,b;
scanf("%i %i",&n,&m);
for(int i=1;i<=m;i++) scanf("%i %i %i %i",&u,&v,&a,&b),u++,v++,edges.pb(Edge(u,v,a,b));
pt F=MST(0,1);
pt S=MST(1,0);
Solve(F,S);
pt sol=MST(ans_ma,ans_mb);
printf("%lld %lld\n",sol.x,sol.y);
for(auto e:tree) printf("%i %i\n",e.first-1,e.second-1);
return 0;
}
Compilation message
timeismoney.cpp: In function 'int main()':
timeismoney.cpp:68:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%i %i",&n,&m);
~~~~~^~~~~~~~~~~~~~~
timeismoney.cpp:69:64: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i=1;i<=m;i++) scanf("%i %i %i %i",&u,&v,&a,&b),u++,v++,edges.pb(Edge(u,v,a,b));
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
256 KB |
Output is correct |
| 2 |
Correct |
2 ms |
380 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
376 KB |
Output is correct |
| 5 |
Correct |
2 ms |
256 KB |
Output is correct |
| 6 |
Correct |
2 ms |
256 KB |
Output is correct |
| 7 |
Correct |
3 ms |
376 KB |
Output is correct |
| 8 |
Correct |
9 ms |
760 KB |
Output is correct |
| 9 |
Correct |
2 ms |
256 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Incorrect |
2 ms |
252 KB |
Output isn't correct |
| 12 |
Correct |
2 ms |
256 KB |
Output is correct |
| 13 |
Correct |
2 ms |
256 KB |
Output is correct |
| 14 |
Correct |
8 ms |
376 KB |
Output is correct |
| 15 |
Incorrect |
6 ms |
376 KB |
Output isn't correct |
| 16 |
Correct |
98 ms |
376 KB |
Output is correct |
| 17 |
Correct |
102 ms |
424 KB |
Output is correct |
| 18 |
Correct |
96 ms |
504 KB |
Output is correct |
| 19 |
Incorrect |
827 ms |
632 KB |
Output isn't correct |
| 20 |
Incorrect |
850 ms |
760 KB |
Output isn't correct |
