Submission #573224

#	Time	Username	Problem	Language	Result	Execution time	Memory
573224		guugiuh	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	565 ms	262144 KiB

Main

#include <bits/stdc++.h>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <vector>
using namespace std;
inline int readInt() {
    int x = 0;
    char ch = getchar_unlocked();
    while (ch < '0' || ch > '9') ch = getchar_unlocked();
    while (ch >= '0' && ch <= '9'){
		x = (x << 3) + (x << 1) + ch - '0';
		ch = getchar_unlocked();
	}
    return x;
}

int MinPyramids(int N, vector<int>X, vector<int>Y) {
    int ms=-20;int n=N;
    vector<int>v(N,1);
    for(int i=0;n>i;++i)if(X[i]+Y[i]>ms)ms=X[i]+Y[i];else v[i]=0;
    ms=-2e9;
    for(int i=n-1;i>=0;--i)if(-X[i]+Y[i]>ms)ms=-X[i]+Y[i];else v[i]=0;
    int t=0;
    for(int i=0;n>i;++i)t+=v[i];
    return t;
}

int main(){
	int N = readInt();
	vector <int> X(N);
	vector <int> Y(N);
	for(int i = 0; i < N; i++) {
		X[i] = readInt();
		Y[i] = readInt();
	}
	int ans= MinPyramids(N,X,Y);
	printf("%d", 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: 20 / 20