Submission #157403

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
157403	2019-10-11 09:54:37	TadijaSebez	Telegraph (JOI16_telegraph)	C++11	100 / 100	41 ms	3960 KiB

telegraph

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int N=100050;
int a[N],c[N],mx1[N],mx2[N];
int was[N];
int main()
{
  int n;
  scanf("%i",&n);
  ll sum=0,ans=0;
  for(int i=1;i<=n;i++) scanf("%i %i",&a[i],&c[i]),sum+=c[i];
  for(int i=1;i<=n;i++) if(was[i]==0)
  {
    int j;
    for(j=i;was[j]==0;j=a[j]) was[j]=i;
    if(was[j]==i)
    {
      int cnt=0;
      for(;was[j]!=-1;j=a[j]) was[j]=-1,cnt++;
      if(cnt==n) return 0*printf("0\n");
    }
  }
  for(int i=1;i<=n;i++)
  {
    mx1[a[i]]=max(mx1[a[i]],c[i]);
    if(was[i]!=-1) mx2[a[i]]=max(mx2[a[i]],c[i]);
  }
  for(int i=1;i<=n;i++) ans+=mx1[i];
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

telegraph.cpp: In function 'int main()':
telegraph.cpp:11:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
telegraph.cpp:13:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%i %i",&a[i],&c[i]),sum+=c[i];
                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 30 / 30
• Subtask 3: 30 / 30
• Subtask 4: 30 / 30