Submission #319662

#	Time	Username	Problem	Language	Result	Execution time	Memory
319662		ignaciocanta	Baloni (COCI15_baloni)	C++14	100 / 100	73 ms	7908 KiB

baloni

#include <bits/stdc++.h>
 
using namespace std;
 
using tint = long long;
using ld = long double;
 
#define forsn(i, s, n) for(int i = s; i < int(n); i++)
#define forn(i, n) forsn(i, 0, n)
 
using vi = vector<int>;
#define pb push_back
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sz(x) (int)(x).size()
 
using pi = pair<int,int>;
#define f first
#define s second
#define mp make_pair
 
#define DBG(x) cerr << #x << " = " << x << endl;
 
const int MOD = 1e9+7;
const int MX = 1e5+5;
const tint INF = 2e18;
const int inf = 2e9;
const ld PI = acos(ld(-1)); 
 
void NACHO(string name = "moop"){
    ios_base::sync_with_stdio(0); cin.tie(0);
   // freopen((name+".in").c_str(), "r", stdin);
   // freopen((name+".in").c_str(), "w", stdout);
}
 
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};

bool valid(int x, int y, int n, int m){
	return (0<=x && x<n && 0<=y && y<m);
}

int main(){
	NACHO();
	int n; cin >> n;
	vi a (n);
	forn(i, n) cin >> a[i];
	vi seen (1e6+1, 0);
	int ret = 0;
	for(int i=n-1;i>=0;--i){
		++seen[a[i]];
		if(!seen[a[i]-1]) ++ret;
		else{
			--seen[a[i]-1];
		}
	}
	cout << ret << "\n";
}

• Subtask 1: 100 / 100