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답안 #208320

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
208320 2020-03-10T17:13:58 Z rzbt Zagrade (COI17_zagrade) C++14
100 / 100
 697 ms 50852 KB 
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define all(x) x.begin(),x.end()
#define F first
#define S second
#define MAXN 300005
using namespace std;
typedef long long ll;
ll n;
char s[MAXN];
ll zagrada[MAXN];
vector<ll> niz[MAXN];
ll obradjen[MAXN];
ll podst[MAXN];
ll cale[MAXN];
ll neg[MAXN],poz[MAXN];
ll res=0;
vector<ll> dodaj;
ll dfsV(ll t,ll o){
    podst[t]=1;
    cale[t]=o;
    for(auto x:niz[t])
        if(x!=o && !obradjen[x])
            podst[t]+=dfsV(x,t);
    return podst[t];
}


void dfsR(ll t,ll o,ll mi,ll ma,ll vkorena,ll vrednost){
    vrednost+=zagrada[t];
    if(vrednost>0 && ma<=vrednost){
        //if(neg[vrednost])printf("k     %lld %lld\n",t,vrednost);
        res+=neg[vrednost];
        dodaj.pb(vrednost-vkorena);
    }
    if(vrednost<0 && mi>=vrednost){
        //if(poz[-vrednost])printf("k     %lld %lld\n",t,vrednost);
        res+=poz[-vrednost];
        dodaj.pb(vrednost-vkorena);
    }
    if(vrednost==0){
        if(mi==0){
            //printf("dodao   %lld\n",t);
            res+=1+(neg[0]+poz[0]);
            dodaj.pb(-1);
        }
        if(ma==0){
            //printf("dodao  %lld\n",t);

            res+=1+(neg[0]+poz[0]);
            dodaj.pb(1);
        }

    }
    for(auto x:niz[t]){
        if(obradjen[x]|| x==o)continue;
        dfsR(x,t,min(mi,vrednost),max(ma,vrednost),vkorena,vrednost);
    }

}


void centroidna(ll c){

    dfsV(c,0);
    ll vel=podst[c];
    for(ll i=0;i<=vel+1;i++){
        neg[i]=0;
        poz[i]=0;
    }
    if(vel==1){
        //printf("    jedan %lld\n",c);
        obradjen[c]=true;
        return;
    }
    while(22){
        bool naso=false;
        for(auto x:niz[c]){
            if(obradjen[x] || x==cale[c])continue;
            if(podst[x]>(vel>>1)){
                c=x;
                naso=true;
                break;
            }
        }
        if(!naso)break;
    }
    /// OVDE IDE OBRADA
    for(auto x:niz[c]){
        if(obradjen[x])continue;
        dfsR(x,c,min(0ll,zagrada[c]),max(0ll,zagrada[c]),zagrada[c],zagrada[c]);
        for(auto y:dodaj){
            if(y>=0)poz[y]++;
            else neg[-y]++;
        }
        dodaj.clear();
    }

    ///OVDE JE KRAJ OBRADE
    //printf("    %lld  %lld\n",c,res);
    obradjen[c]=true;
    for(auto x:niz[c]){
        if(!obradjen[x])centroidna(x);
    }
}


int main()
{
    scanf("%lld", &n);
    scanf("%s",s);
    for(ll i=1;i<=n;i++)
        zagrada[i]=(s[i-1]=='('?1:-1);
    for(ll i=1;i<n;i++){
        ll t1,t2;
        scanf("%lld %lld", &t1, &t2);
        niz[t1].pb(t2);
        niz[t2].pb(t1);
    }

    centroidna(1);
    printf("%lld",res);
    return 0;
}

Compilation message

zagrade.cpp: In function 'int main()':
zagrade.cpp:111:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &n);
     ~~~~~^~~~~~~~~~~~
zagrade.cpp:112:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s",s);
     ~~~~~^~~~~~~~
zagrade.cpp:117:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &t1, &t2);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7420 KB Output is correct
2 Correct 11 ms 7544 KB Output is correct
3 Correct 10 ms 7544 KB Output is correct
4 Correct 9 ms 7544 KB Output is correct
5 Correct 9 ms 7544 KB Output is correct
6 Correct 10 ms 7544 KB Output is correct
7 Correct 9 ms 7544 KB Output is correct
8 Correct 9 ms 7544 KB Output is correct
9 Correct 11 ms 7544 KB Output is correct
10 Correct 9 ms 7544 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 309 ms 49084 KB Output is correct
2 Correct 314 ms 50160 KB Output is correct
3 Correct 308 ms 49404 KB Output is correct
4 Correct 310 ms 50152 KB Output is correct
5 Correct 305 ms 49400 KB Output is correct
6 Correct 302 ms 49904 KB Output is correct
7 Correct 299 ms 49400 KB Output is correct
8 Correct 309 ms 49904 KB Output is correct
9 Correct 291 ms 49400 KB Output is correct
10 Correct 305 ms 50852 KB Output is correct
11 Correct 296 ms 50660 KB Output is correct

Subtask #3
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 7420 KB Output is correct
2 Correct 11 ms 7544 KB Output is correct
3 Correct 10 ms 7544 KB Output is correct
4 Correct 9 ms 7544 KB Output is correct
5 Correct 9 ms 7544 KB Output is correct
6 Correct 10 ms 7544 KB Output is correct
7 Correct 9 ms 7544 KB Output is correct
8 Correct 9 ms 7544 KB Output is correct
9 Correct 11 ms 7544 KB Output is correct
10 Correct 9 ms 7544 KB Output is correct
11 Correct 309 ms 49084 KB Output is correct
12 Correct 314 ms 50160 KB Output is correct
13 Correct 308 ms 49404 KB Output is correct
14 Correct 310 ms 50152 KB Output is correct
15 Correct 305 ms 49400 KB Output is correct
16 Correct 302 ms 49904 KB Output is correct
17 Correct 299 ms 49400 KB Output is correct
18 Correct 309 ms 49904 KB Output is correct
19 Correct 291 ms 49400 KB Output is correct
20 Correct 305 ms 50852 KB Output is correct
21 Correct 296 ms 50660 KB Output is correct
22 Correct 696 ms 37740 KB Output is correct
23 Correct 686 ms 37616 KB Output is correct
24 Correct 683 ms 37496 KB Output is correct
25 Correct 697 ms 37620 KB Output is correct
26 Correct 345 ms 41376 KB Output is correct
27 Correct 348 ms 39544 KB Output is correct
28 Correct 353 ms 38520 KB Output is correct
29 Correct 297 ms 50764 KB Output is correct
30 Correct 290 ms 50660 KB Output is correct
31 Correct 115 ms 39780 KB Output is correct
32 Correct 295 ms 50664 KB Output is correct