Submission #342459

#	Time	Username	Problem	Language	Result	Execution time	Memory
342459		urd05	Spring cleaning (CEOI20_cleaning)	C++14	0 / 100	22 ms	364 KiB

cleaning

#include <bits/stdc++.h>
using namespace std;

bool used[100000];

int main(void) {
    int n;
    scanf("%d",&n);
    int q;
    scanf("%d",&q);
    for(int i=1;i<n;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
    }
    int x;
    scanf("%d",&x);
    int l=0;
    for(int i=0;i<x;i++) {
        int v;
        scanf("%d",&v);
        v--;
        if (used[v]) {
            l++;
        }
        used[v]=true;
    }
    printf("%d",(l%2==0?n-1+x:-1));
}

Compilation message (stderr)

cleaning.cpp: In function 'int main()':
cleaning.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
cleaning.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d",&q);
      |     ~~~~~^~~~~~~~~
cleaning.cpp:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~
cleaning.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |     scanf("%d",&x);
      |     ~~~~~^~~~~~~~~
cleaning.cpp:20:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |         scanf("%d",&v);
      |         ~~~~~^~~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 0 / 9
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 17
• Subtask 7: 0 / 30