Submission #426274

#	Time	Username	Problem	Language	Result	Execution time	Memory
426274		Amylopectin	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2058 ms	76664 KiB

Main

#include <iostream>
#include <stdio.h>
using namespace std;
const int mxn = 1e7 + 10;
struct we
{
    int xx,yy;
};
struct we a[mxn] = {};
int main()
{
    ios::sync_with_stdio(false);
    int i,j,n,m,ru = -1,cx,cy;
    scanf("%d",&n);
    for(i=0; i<n; i++)
    {
        scanf("%d %d",&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};
        }
    }
    printf("%d\n",ru + 1);
    return 0;
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:13:11: warning: unused variable 'j' [-Wunused-variable]
   13 |     int i,j,n,m,ru = -1,cx,cy;
      |           ^
lightningrod.cpp:13:15: warning: unused variable 'm' [-Wunused-variable]
   13 |     int i,j,n,m,ru = -1,cx,cy;
      |               ^
lightningrod.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
lightningrod.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         scanf("%d %d",&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