comingsoon.cpp's blog

By comingsoon.cpp, history, 6 weeks ago, In English

Hello Guys.. I was trying to solve This atcoder problem From the last beginner contest but i was not able to come up with a working solution during the contest...After some upsolving, i finally came up with a solution that seems to work but the only problem is that it get's TLE on all the tests except the first three for which it passes and I don't know/understand why. This was the first ever ABC problem D that i have attempted after reading the problem statement.

This is the code below and I just need a little help or maybe come hints as to how to make it work because i can't think of a way to optimize it further.

#include <set>
#include <numeric>
#include <algorithm>
#include <vector>
#include <iostream>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;

int check(vector<int> a){
	int q = a.size();
	set<int> s; for(int i = 0; i < q; i++){
	return s.size();
void solve(){
	int n , t; cin >> n >> t;
	vector<int> mex; for(int i = 0; i < n; i++) mex.push_back(0);
	for(int i = 0; i < t; i++){
		int a, b; cin >> a >> b;
		mex[a-1] += b;
		cout << check(mex) << endl;
int main (){
	//ll t; cin >> t;
return 0;
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6 weeks ago, # |
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Hint 1
Hint 2
Hint 3
  • »
    6 weeks ago, # ^ |
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    What do you think will be the rating of this problem in codeforces rating criteria?

6 weeks ago, # |
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you are solving in O(N^2) this won't pass obviously. just use a frequency map and a set to keep track of distinct values. and insert a[i]+k and remove a[i] from the set if its frequency is 0 now. this is my submission to it. maybe look at it if you are stuck.

6 weeks ago, # |
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It's pretty clear a set is difficult to implement with this, but there's another fast data structure you can use to keep track of different scores and the number of times they occur...