Submission #743028

#	Time	Username	Problem	Language	Result	Execution time	Memory
743028		vjudge1	Lightning Rod (NOI18_lightningrod)	C++17	0 / 100	2084 ms	168168 KiB

Main

#include<iostream>
#include<set>
#include<map>

int n,cnt;
std::map<int, bool> mp;

int main()
{
    scanf("%d",&n);
    for(int i = 0; i<n; ++i){
        int x,y; scanf("%d %d",&x,&y);
        if(mp[x]) continue;
        mp[x] = 1;
        ++cnt;
    }
    printf("%d",cnt);
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
lightningrod.cpp:12:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         int x,y; scanf("%d %d",&x,&y);
      |                  ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20