#include <bits/stdc++.h>
using namespace std;
#define ldb long double
#define ll long long
#define pb push_back
#define mp make_pair
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){}
ldb Get(ldb k){ return k*a+(1-k)*b;}
};
vector<Edge> edges;
vector<pair<int,int>> tree;
ldb k;
bool comp(Edge x, Edge y)
{
if(k==1) return mp(x.a,x.b)<mp(y.a,y.b);
if(k==0) return mp(x.b,x.a)<mp(y.b,y.a);
return x.Get(k)<y.Get(k);
}
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;
ldb ans_k;
pair<int,int> MST(ldb k)
{
DS.init();
tree.clear();
::k=k;
sort(edges.begin(),edges.end(),comp);
int 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,(ll)A*B);
if(ans==A*B) ans_k=k;
return {A,B};
}
bool below(pair<int,int> z, pair<int,int> x, pair<int,int> y)
{
y.first-=x.first;
y.second-=x.second;
z.first-=x.first;
z.second-=x.second;
return z.first*y.second>z.second*y.first;
}
void Solve(pair<int,int> F, pair<int,int> S)
{
ldb k;
if(F.first==S.first) k=1;
else k=(ldb)(S.first-F.first)/(S.first-F.first+F.second-S.second);
pair<int,int> M=MST(k);
if(below(M,F,S))
{
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));
pair<int,int> F=MST(1);
pair<int,int> S=MST(0);
Solve(F,S);
pair<int,int> sol=MST(ans_k);
printf("%i %i\n",sol.first,sol.second);
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:78:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%i %i",&n,&m);
~~~~~^~~~~~~~~~~~~~~
timeismoney.cpp:79:64: 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 |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
256 KB |
Output is correct |
| 4 |
Correct |
2 ms |
256 KB |
Output is correct |
| 5 |
Correct |
2 ms |
256 KB |
Output is correct |
| 6 |
Correct |
2 ms |
376 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 |
256 KB |
Output is correct |
| 11 |
Incorrect |
2 ms |
256 KB |
Output isn't correct |
| 12 |
Incorrect |
2 ms |
376 KB |
Output isn't correct |
| 13 |
Incorrect |
3 ms |
376 KB |
Output isn't correct |
| 14 |
Incorrect |
3 ms |
256 KB |
Output isn't correct |
| 15 |
Correct |
3 ms |
376 KB |
Output is correct |
| 16 |
Incorrect |
6 ms |
376 KB |
Output isn't correct |
| 17 |
Incorrect |
5 ms |
380 KB |
Output isn't correct |
| 18 |
Incorrect |
5 ms |
376 KB |
Output isn't correct |
| 19 |
Incorrect |
19 ms |
760 KB |
Output isn't correct |
| 20 |
Incorrect |
19 ms |
732 KB |
Output isn't correct |
