Submission #342477

#	Time	Username	Problem	Language	Result	Execution time	Memory
342477		urd05	Spring cleaning (CEOI20_cleaning)	C++14	9 / 100	53 ms	1000 KiB

cleaning

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

int main(void) {
    int n,q;
    scanf("%d %d",&n,&q);
    for(int i=1;i<n;i++) {
        int u,v;
        scanf("%d %d",&u,&v);
    }
    vector<int> v;
    int en=n-1;
    int k;
    scanf("%d",&k);
    int l=2;
    for(int i=0;i<k;i++) {
        int x;
        scanf("%d",&x);
        x--;
        if (x==n-1&&en==n-1) {
            en++;
        }
        else {
            v.push_back(x);
            l++;
        }
    }
    v.push_back(0);
    v.push_back(en);
    sort(v.begin(),v.end());
    if (l%2==1) {
        printf("-1");
        return 0;
    }
    int ret=n-1+k;
    for(int i=1;i<en;i++) {
        int sum=lower_bound(v.begin(),v.end(),i)-v.begin();
        if (sum%2==0) {
            ret++;
        }
    }
    printf("%d",ret);
}

Compilation message (stderr)

cleaning.cpp: In function 'int main()':
cleaning.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d %d",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~~
cleaning.cpp:9:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |         scanf("%d %d",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~
cleaning.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%d",&k);
      |     ~~~~~^~~~~~~~~
cleaning.cpp:18:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |         scanf("%d",&x);
      |         ~~~~~^~~~~~~~~

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