Submission #361719

#	Time	Username	Problem	Language	Result	Execution time	Memory
361719		wildturtle	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2068 ms	73884 KiB

Main

#include<bits/stdc++.h>
using namespace std;
int a,b,c,d,n;
bool l;
stack < pair <int , int > > st;
int main() {
    //ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  scanf ("%d",&n);
    for(int i=1;i<=n;i++) {
        scanf ("%d",&a);
        scanf ("%d",&b);
        l=0;
        while(!st.empty()) {
            c=st.top().first;
            d=st.top().second;
            if(a+b<=c+d) { l=1; break; }
            if(a-b<=c-d) st.pop();
            else break;
        }
        if(l==0) st.push({a,b});
    }
    cout<<st.size();
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:8:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |   scanf ("%d",&n);
      |   ~~~~~~^~~~~~~~~
lightningrod.cpp:10:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |         scanf ("%d",&a);
      |         ~~~~~~^~~~~~~~~
lightningrod.cpp:11:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |         scanf ("%d",&b);
      |         ~~~~~~^~~~~~~~~

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