Submission #709690

#	Time	Username	Problem	Language	Result	Execution time	Memory
709690		Antekb	Monochrome Points (JOI20_monochrome)	C++17	0 / 100	1 ms	212 KiB

monochrome

#include<bits/stdc++.h>

#define st first
#define nd second
#define eb emplace_back
#define pb push_back
#define pp pop_back
#define all(x) x.begin(), x.end()

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

void debug(){cerr<<"\n";}
template<typename H, typename... T>
void debug(H h, T... t){cerr<<h;if(sizeof...(t))cerr<<", ";debug(t...);};
#define deb(x...) cerr<<#x<<" = ";debug(x);

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

const int N=1e5+5, INF=1e9+5;

int main(){
	//ios_base::sync_with_stdio(0);cin.tie(0);
	int n;
	cin>>n;
	string s;
	cin>>s;
	int wsk=n, wsk2=n;
	vi V(n);
	for(int i=0; i<n; i++){
		//deb(wsk, wsk2);
		if(s[i]=='B'){
			while(s[wsk]=='B')wsk++;
			V[wsk-n]=i;
			wsk++;
		}
		else{
			while(s[wsk2]=='W')wsk2++;
			V[wsk2-n]=i;
			wsk2++;
		}
	}
	int ans=0;
	for(int i=0; i<n; i++){
		//deb(V[i]);
		for(int j=i+1; j<n; j++){
			if(V[i]<V[j])ans++;
		}
	}
	cout<<ans;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 21
• Subtask 3: 0 / 10
• Subtask 4: 0 / 65