Submission #426519

#	Time	Username	Problem	Language	Result	Execution time	Memory
426519		Amylopectin	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2103 ms	72548 KiB

Main

//#include <iostream>
//#include <stdio.h>
//#include <stdlib.h>
#include <bits/stdc++.h>
using namespace std;
const int mxn = 2e7 + 10;
struct we
{
    int xx,yy;
};
struct we a[mxn] = {};
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int i,j,n,m,ru = -1,cx,cy;
    cin >> n;
//    scanf("%d",&n);
    for(i=0; i<n; i++)
    {
        cin >> cx >> cy;
//        if(ru == -1)
//        {
//            ru ++;
//            a[ru] = {cx,cy};
//            continue;
//        }
//        scanf("%d %d",&cx,&cy);
//        if(cx - a[ru].xx <= a[ru].yy - cy)
//        {
////            ru ++;
////            a[ru] = {cx,cy};
//            continue;
//        }
//        while(ru >= 0 && cx - a[ru].xx <= cy - a[ru].yy)
//        {
//            ru --;
//        }
//        if(ru == -1 || cx - a[ru].xx > a[ru].yy - cy)
//        {
//            ru ++;
//            a[ru] = {cx,cy};
//        }
        while(ru >= 0 && cx - a[ru].xx <= cy - a[ru].yy)
        {
            ru --;
        }
        if(ru == -1 || cx - a[ru].xx > a[ru].yy - cy)
        {
            ru ++;
            a[ru] = {cx,cy};
        }
    }
    cout << ru + 1 << "\n";
//    printf("%d\n",ru + 1);
    return 0;
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:17:11: warning: unused variable 'j' [-Wunused-variable]
   17 |     int i,j,n,m,ru = -1,cx,cy;
      |           ^
lightningrod.cpp:17:15: warning: unused variable 'm' [-Wunused-variable]
   17 |     int i,j,n,m,ru = -1,cx,cy;
      |               ^

• 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