#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif
using ll=long long;
using pii=array<int,2>;
using tii=array<int,3>;
const ll inf=1e18;
const int N=2e5+5;
int n,m;
int in[N],w[N],ans;
vector<int> v[N];
tii a[N];
struct ST{
int T[2*N],D[2*N];
void init(int nd,int l,int r){
if(l==r){
T[nd]=w[l];
D[nd]=0;
return;
}
int m=(l+r)>>1,ln=nd+1,rn=nd+2*(m-l+1);
init(ln,l,m); init(rn,m+1,r);
T[nd]=min(T[ln],T[rn]);
D[nd]=0;
}
void upd(int nd,int l,int r,int s,int e,int v){
if(r<s||e<l) return;
if(s<=l&&r<=e){
T[nd]+=v;
D[nd]+=v;
return;
}
int m=(l+r)>>1,ln=nd+1,rn=nd+2*(m-l+1);
upd(ln,l,m,s,e,v); upd(rn,m+1,r,s,e,v);
T[nd]=min(T[ln],T[rn])+D[nd];
}
int qry(int nd,int l,int r,int s,int e){
if(r<s||e<l) return 1e9;
if(s<=l&&r<=e) return T[nd];
int m=(l+r)>>1,ln=nd+1,rn=nd+2*(m-l+1);
return min(qry(ln,l,m,s,e),qry(rn,m+1,r,s,e))+D[nd];
}
}T;
int Do(int s){
if(s==n+m) return 1e9;
int ret=s;
for(int i=1;i<=n;i++){
w[i]=s-m+in[i];
w[i]/=2;
}
T.init(1,1,n);
for(int r=1;r<n;r++){
for(int l: v[r]){
if(T.qry(1,1,n,l,r)==0) break;
T.upd(1,1,n,l,r,-1);
ret--;
}
}
return ret;
}
int main(){
ios::sync_with_stdio(false); cin.tie(0);
cin>>n>>m;
for(int i=1;i<=m;i++){
cin>>a[i][0]>>a[i][1]>>a[i][2];
if(a[i][0]>a[i][1]) swap(a[i][0],a[i][1]);
in[a[i][0]]+=a[i][2];
in[a[i][1]]-=a[i][2];
v[a[i][1]-1].emplace_back(a[i][0]);
}
for(int i=1;i<=n;i++) in[i]+=in[i-1];
for(int i=1;i<=n;i++) sort(v[i].begin(),v[i].end(),greater<>());
ans=m;
int L=m,R=n+m-1;
while(L<=R){
int M=(L+R)>>1;
int v1=Do(M),v2=Do(M+1);
if(v1<v2){
ans=min(ans,v1);
R=M-1;
} else{
ans=min(ans,v2);
L=M+1;
}
}
/*for(int i=m;i<=n+m-1;i++){
int v=Do(i);
debug(i,v);
ans=min(ans,v);
}*/
cout<<ans;
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
3 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
3 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
3 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
3 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
3 ms |
4948 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |