Submission #738134

#	Time	Username	Problem	Language	Result	Execution time	Memory
738134		mosiashvililuka	Hotspot (NOI17_hotspot)	C++14	100 / 100	828 ms	1284 KiB

hotspot

#include<bits/stdc++.h>
using namespace std;
long double A,B,C,D,X,Y,Z,val[5009],pas;
int a,b,c,d,e,i,j,ii,jj,zx,xc,tes,t,dp[5009][2],bo[5009],lvl[5009],dis[5009][2],ans;
vector <int> v[5009];
deque <int> de;
void fun(int q, int w, int H){
    while(de.size()) de.pop_back();
    for(i=0; i<=a+2; i++){
        dp[i][H]=0;bo[i]=0;lvl[i]=0;dis[i][H]=a+4;
    }
    dp[q][H]=1;lvl[q]=1;bo[q]=1;dis[q][H]=0;
    de.push_back(q);
    while(de.size()){
        c=de.front();de.pop_front();
        for(vector <int>::iterator it=v[c].begin(); it!=v[c].end(); it++){
            if(bo[(*it)]==1){
                if(lvl[(*it)]==lvl[c]+1){
                    dp[(*it)][H]+=dp[c][H];
                }
                continue;
            }
            dis[(*it)][H]=dis[c][H]+1;
            lvl[(*it)]=lvl[c]+1;
            dp[(*it)][H]=dp[c][H];
            bo[(*it)]=1;
            de.push_back((*it));
        }
    }
}
int main(){
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>a>>b;
    for(i=1; i<=b; i++){
        cin>>c>>d;c++;d++;
        v[c].push_back(d);
        v[d].push_back(c);
    }
    cin>>tes;
    for(t=1; t<=tes; t++){
        cin>>c>>d;c++;d++;
        fun(c,d,0);
        fun(d,c,1);
        for(i=1; i<=a; i++){
            if(dis[i][0]+dis[i][1]!=dis[d][0]) continue;
            A=dp[d][0];
            B=dp[i][0];C=dp[i][1];B*=C;
            val[i]+=B/A;
        }
    }
    pas=-1.0;ans=0;
    for(i=1; i<=a; i++){
        if(val[i]>pas){
            pas=val[i];ans=i;
        }
    }
    //cout<<setprecision(12)<<pas<<"\n";
    cout<<ans-1;
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 11 / 11
• Subtask 4: 18 / 18
• Subtask 5: 26 / 26
• Subtask 6: 36 / 36