Submission #206729

#	Time	Username	Problem	Language	Result	Execution time	Memory
206729		rzbt	Putovanje (COCI20_putovanje)	C++14	110 / 110	330 ms	37752 KiB

putovanje

#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define MAXN 200005
typedef long long ll;

using namespace std;
ll n,res,res2;
vector<pair<ll,pair<ll,ll> > > niz[MAXN];
ll dubina[MAXN];
ll predak[MAXN][21];
ll dodaj[MAXN],oduzmi[MAXN];

void lca(ll a,ll b){
    if(dubina[b]>dubina[a])swap(a,b);
    ll pa=a,pb=b;
    for(ll i=20;i>=0;i--){
        if(dubina[predak[a][i]]>=dubina[b]){
            a=predak[a][i];
        }
    }

    if(a==b){
        a=pa;
        for(ll i=20;i>=0;i--){
        if(dubina[predak[a][i]]>dubina[b]){
            a=predak[a][i];
        }
    }
        dodaj[a]++;
        oduzmi[pa]++;
        return;
    }
    //printf("  %lld %lld    %lld %lld\n",a,pa,b,pb);
    for(ll i=20;i>=0;i--){
        if(predak[a][i]!=predak[b][i]){
            a=predak[a][i];
            b=predak[b][i];
        }
    }

    dodaj[a]++;
    dodaj[b]++;
    oduzmi[pa]++;
    oduzmi[pb]++;


}
void dfsI(ll t,ll o,ll h){
    dubina[t]=h;
    predak[t][0]=o;
    for(auto x:niz[t]){
        if(x.F==o)continue;
        dfsI(x.F,t,h+1);
    }
}
ll tren=0;
int dfs(ll t,ll o ,ll c1,ll cv){

    int xyz=oduzmi[t];
    //printf("  %lld    %lld  %lld\n",t,tren*c1,cv);
    for(auto x:niz[t])
        if(x.F!=o)
            xyz+=dfs(x.F,t,x.S.F,x.S.S);
    res+=min(xyz*c1,cv);
    xyz-=dodaj[t];
    return xyz;
}



int main()
{
    scanf("%lld", &n);
    for(ll i=1;i<n;i++){
        ll t1,t2,c1,c2;
        scanf("%lld %lld %lld %lld", &t1, &t2, &c1, &c2);
        niz[t1].pb(mp(t2,mp(c1,c2)));
        niz[t2].pb(mp(t1,mp(c1,c2)));
    }
    dfsI(1,0,1);
    for(ll j=1;j<=20;j++){
        for(ll i=1;i<=n;i++){
            predak[i][j]=predak[predak[i][j-1]][j-1];
        }
    }
    for(ll i=1;i<n;i++){
        lca(i,i+1);
    }
    dfs(1,0,0,0);
    printf("%lld",res);
    return 0;
}

Compilation message (stderr)

putovanje.cpp: In function 'int main()':
putovanje.cpp:77:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &n);
     ~~~~~^~~~~~~~~~~~
putovanje.cpp:80:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld %lld %lld", &t1, &t2, &c1, &c2);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 25 / 25
• Subtask 3: 65 / 65