Submission #38631

#	Time	Username	Problem	Language	Result	Execution time	Memory
38631		MrPlany	Simple game (IZhO17_game)	C++14	22 / 100	189 ms	6472 KiB

game

#include <bits/stdc++.h>
using namespace std;

const int N = 1e6, maxn=1e5+5;

int t[N+5],a[maxn];
int n;

void add(int k, int x) {
	while (k <= N) {
		t[k] += x;
		k += k&-k;
	}
}

void gosh(int a, int b, int val){
	if(a>b) swap(a,b);
	add(a,val);
	add(b+1,-val);
}

int sum(int k) {
	int s = 0;
	while (k >= 1) {
		s += t[k];
		k -= k&-k;
	}
	return s;
}

int main(){
	ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
	cin>>n;
	
	int q;
	cin>>q;
	for(int i=1;i<=n;i++) cin>>a[i];
	for(int i=1;i<n;i++) gosh(a[i],a[i+1],1);
	int pos, val, type;
		
	while(q--){
		cin>>type;
		if(type==1){
			cin>>pos>>val;
			if(pos>1) gosh(a[pos-1],a[pos],-1);
			if(pos<n) gosh(a[pos],a[pos+1],-1);
			a[pos] = val;
			if(pos>1) gosh(a[pos-1],a[pos],1);
			if(pos<n) gosh(a[pos],a[pos+1],1);
		}
		else{
			cin>>pos;
			cout << sum(pos) << endl;
		}
		
	}
	
}

• Subtask 1: 22 / 22
• Subtask 2: 0 / 27
• Subtask 3: 0 / 51