Submission #137680

#	Time	Username	Problem	Language	Result	Execution time	Memory
137680		hamzqq9	Lightning Rod (NOI18_lightningrod)	C++14	0 / 100	225 ms	79444 KiB

Main

#include<bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define ppb pop_back
#define ii pair<int,int>
#define ll long long
#define umin(x,y) x=min(x,y)
#define umax(x,y) x=max(x,y)
#define orta ((bas+son)>>1)
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define inf 2000000000
#define N 500005
#define MOD 1000000007
using namespace std;

static char stdinBuffer[1024];
static char* stdinDataEnd = stdinBuffer + sizeof (stdinBuffer);
static const char* stdinPos = stdinDataEnd;

void readAhead(size_t amount)
{
    size_t remaining = stdinDataEnd - stdinPos;
    if (remaining < amount) {
       memmove(stdinBuffer, stdinPos, remaining);
       size_t sz = fread(stdinBuffer + remaining, 1, sizeof (stdinBuffer) - remaining, stdin);
       stdinPos = stdinBuffer;
       stdinDataEnd = stdinBuffer + remaining + sz;
       if (stdinDataEnd != stdinBuffer + sizeof (stdinBuffer))
         *stdinDataEnd = 0;
    }
}

int readInt()
{
    readAhead(16);

    int x = 0;
    bool neg = false;
    if (*stdinPos == '-') {
       ++stdinPos;
       neg = true;
    }

    while (*stdinPos >= '0' && *stdinPos <= '9') {
       x *= 10;
       x += *stdinPos - '0';
       ++stdinPos;
    }

    return neg ? -x : x;
}

bitset<10000000> u;

int main() {

	int n;

	//scanf("%d",&n);

	n=readInt();

	vector<ii> a(n);
	int cnt=n;

	for(int i=0;i<n;i++) {

		//scanf("%d %d",&a[i].st,&a[i].nd);

		a[i].st=readInt();
		a[i].nd=readInt();

	}

	int mn=inf;

	for(int i=n-1;i>=0;i--) {

		int val=a[i].st-a[i].nd;

		if(mn<=val) {

			cnt-=!u[i];
			u[i]=1;

		}

		umin(mn,val);

	}

	int mx=-inf;

	for(int i=0;i<n;i++) {

		int val=a[i].st+a[i].nd;

		if(mx>=val) {

			cnt-=!u[i];
			u[i]=1;

		}

		umax(mx,val);

	}

	printf("%d",cnt);

}

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