Submission #1575263


Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int TAM = 100004;

vector <ll> adj [TAM];
ll val [TAM], pt [TAM];
int n;

void form( int x ){
    int nxt;
    for( int i = 0 ; i < adj[x].size() ; i ++ ){
        nxt = adj[x][i];
        if( nxt == pt[x] ) continue;
        pt[nxt] = x;
        //cout << " parent " << nxt << " = " << pt[nxt] << endl ;
        form(nxt);
    }
}

ll dn, up;
void solve ( ll cap , ll sum ){
    dn = sum - cap;
    up = cap - dn;
}

bool pos = 1;

ll find_up( int x ){
    //cout << " IN " << x << endl ;
    if( adj[x].size() == 1 ) return val[x];
    ll sum = 0, cap = val[x];
    int nxt;
    ll v;
    for( int i = 0 ; i < adj[x].size() ; i ++ ){
        nxt = adj[x][i];
        if( nxt == pt[x] ) continue;
        v = find_up(nxt);
        sum += v;
        //cout << x << " -> " << nxt << " = " << v << endl ;
    }
    solve( cap , sum );
    if( dn + up != cap or dn < 0 or up < 0 ) pos = 0;
    return up;
}

int main(){

    int a, b;
    scanf("%d",&n);
    for( int i = 1 ; i <= n ; i ++ )
        scanf("%lld",&val[i]);
    for( int i = 0 ; i < n-1 ; i ++ ){
        scanf("%d%d",&a,&b);
        adj[a].push_back(b);
        adj[b].push_back(a);
    }

    int rt;
    for( int i = 1 ; i <= n ; i ++ ){
        if( adj[i].size() > 1 ){
            pt [i] = i;
            form(i);
            rt = i;
            break;
        }
    }
    if( !find_up(rt) and pos ) printf("YES\n");
    else printf("NO\n");

    return 0;
}

Submission Info

Submission Time
Task C - Cleaning
User vjudge1
Language C++14 (GCC 5.4.1)
Score 0
Code Size 1500 Byte
Status WA
Exec Time 57 ms
Memory 12672 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:50:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:52:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld",&val[i]);
                              ^
./Main.cpp:54:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&a,&b);
                            ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 0 / 700
Status
AC × 3
AC × 45
WA × 6
Set Name Test Cases
Sample sample1.txt, sample2.txt, sample3.txt
All sample1.txt, sample2.txt, sample3.txt, in1.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in2.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in3.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in4.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in5.txt, in6.txt, in7.txt, in8.txt, in9.txt, sample1.txt, sample2.txt, sample3.txt
Case Name Status Exec Time Memory
in1.txt AC 52 ms 7936 KB
in10.txt AC 52 ms 7936 KB
in11.txt AC 54 ms 11648 KB
in12.txt AC 54 ms 11648 KB
in13.txt AC 50 ms 12672 KB
in14.txt AC 50 ms 11904 KB
in15.txt AC 2 ms 2560 KB
in16.txt AC 2 ms 2560 KB
in17.txt AC 2 ms 2560 KB
in18.txt WA 2 ms 2560 KB
in19.txt WA 53 ms 7936 KB
in2.txt AC 53 ms 7936 KB
in20.txt WA 54 ms 7936 KB
in21.txt WA 53 ms 7936 KB
in22.txt WA 53 ms 7936 KB
in23.txt AC 53 ms 7936 KB
in24.txt AC 57 ms 7936 KB
in25.txt AC 2 ms 2560 KB
in26.txt AC 55 ms 7936 KB
in27.txt AC 55 ms 7936 KB
in28.txt AC 2 ms 2560 KB
in29.txt AC 51 ms 7936 KB
in3.txt AC 53 ms 7936 KB
in30.txt AC 2 ms 2560 KB
in31.txt AC 56 ms 7936 KB
in32.txt AC 56 ms 7936 KB
in33.txt AC 52 ms 7936 KB
in34.txt AC 52 ms 7936 KB
in35.txt AC 52 ms 7936 KB
in36.txt AC 52 ms 7936 KB
in37.txt AC 2 ms 2688 KB
in38.txt AC 53 ms 7936 KB
in39.txt AC 52 ms 7936 KB
in4.txt AC 52 ms 7936 KB
in40.txt AC 52 ms 7936 KB
in41.txt AC 52 ms 7936 KB
in42.txt AC 52 ms 7936 KB
in43.txt AC 52 ms 7936 KB
in44.txt WA 53 ms 7936 KB
in45.txt AC 52 ms 7936 KB
in5.txt AC 52 ms 7936 KB
in6.txt AC 52 ms 7936 KB
in7.txt AC 46 ms 7296 KB
in8.txt AC 13 ms 3840 KB
in9.txt AC 52 ms 7936 KB
sample1.txt AC 2 ms 2560 KB
sample2.txt AC 2 ms 2560 KB
sample3.txt AC 2 ms 2560 KB