Submission #979141

#	Time	Username	Problem	Language	Result	Execution time	Memory
979141		MilosMilutinovic	Lightning Rod (NOI18_lightningrod)	C++14	80 / 100	2078 ms	262144 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int MAX = 10000005;

int x[MAX], y[MAX], ord[MAX];

bool cmp(int i, int j) {
  return make_pair(x[i], -y[i]) < make_pair(x[j], -y[j]);
}

int readint(){
  int x=0,f=1; char ch=getchar();
  while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
  while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
  return x*f;
}

int main() {
  int n, a, b, i;
  n = readint();
  for (i = 0; i < n; i++) {
    a = readint();
    b = readint();
    x[i] = a - b;
    y[i] = a + b;
    ord[i] = i;
  }
  sort(ord, ord + n, cmp);
  int ans = 0, mx = -1;
  for (int i = 0; i < n; i++) {
    if (mx < y[ord[i]]) {
      ans += 1;
      mx = y[ord[i]];
    }
  }
  printf("%d\n", ans);
  return 0;
}

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