Submission #979144

#	Time	Username	Problem	Language	Result	Execution time	Memory
979144		MilosMilutinovic	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	614 ms	178196 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int MAX = 10000005;

int x[MAX], y[MAX];

stack<pair<int, int>> stk;

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();
    int x = a - b;
    int y = a + b;
    while (!stk.empty() && stk.top().first >= x && stk.top().second <= y) {
      stk.pop();
    }
    if (stk.empty() || stk.top().second < y) {
      stk.push({x, y});
    }
  }
  printf("%d\n", (int) stk.size());
  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: 20 / 20