建边的vector数组开1e5+10最后一个点RE
改为2e5+10后AC
记录:
下面附上代码(RE 80tps)
#include<bits/stdc++.h>
#define ll long long
#define endl '\n'
#define up(i,j,k,l) for(int i=j;i<=k;i+=l)
#define down(i,j,k,l) for(int i=j;i>=k;i-=l)
using namespace std;
const int N=1e5+10;
int n,m,x,y;
vector<int> vc[N],tp;
int d[N];
queue<int> q;
int dp[N];
void solve()
{
cin>>n>>m;
up(i,1,m,1){
cin>>x>>y;
vc[x].push_back(y);
d[y]++;
dp[i]=1;
}
up(i,1,n,1){
if(d[i]==0){
q.push(i);
tp.push_back(i);
}
}
while(!q.empty()){
x=q.front();
q.pop();
for(auto fw:vc[x]){
d[fw]--;
if(d[fw]==0){
q.push(fw);
tp.push_back(fw);
}
}
}
for(auto fw1:tp){
for(auto fw2:vc[fw1]){
dp[fw2]=max(dp[fw2],dp[fw1]+1);
}
}
up(i,1,n,1){
cout<<dp[i]<<endl;
}
return;
}
int main()
{
//ios::sync_with_stdio(false);
//cin.tie(0);
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
int _=1;
//cin>>_;
up(i,1,_,1){
solve();
}
return 0;
}
@洛谷