Submission #418059

#	Time	Username	Problem	Language	Result	Execution time	Memory
418059		FerThugGato12500	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	10 ms	3304 KiB

ho_t2

#include<bits/stdc++.h>
#define forn(i, n) for(int i = 0; i < int(n); i++)
#define ll long long
const int lmt = 200005;
using namespace std;
int prefix[3][lmt];
int op(int i, int j, int type){
	return (i<=j ? prefix[type][j] - (i>0 ? prefix[type][i-1] : 0) : 0);
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int n, k; string s; cin>>n>>k>>s;
	int a[3]={0,0,0};
	forn(i, n){
		char x = s[i];
		if(x=='J'){
			prefix[0][i]++;
		}else if(x=='O'){
			prefix[1][i]++;
		}else{
			prefix[2][i]++;
		}
		if(i>0) {
			forn(j, 3){
				prefix[j][i] += prefix[j][i-1];
			}
		}
	}	
	int fin[3]={0,0,0};
	int d = n;
	for(int i = 0; i < n; i++){
		int last = i;
		forn(t, 3){
			while(fin[t]<n && op(last,fin[t], t)!=k){
				fin[t]++;
			}
			if(op(last, fin[t], t)!=k){
				cout<<(i>0 ? d : -1);
				return 0;
			}
			last = fin[t]+1;
		}
		d = min(d, (((fin[0] - i)+1) - k) + (((fin[1] - (fin[0]+1))+1) - k) + (((fin[2] - (fin[1]+1))+1) - k));
	}
	cout<<d;
	return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:14:6: warning: unused variable 'a' [-Wunused-variable]
   14 |  int a[3]={0,0,0};
      |      ^

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87