Submission #924519

#	Time	Username	Problem	Language	Result	Execution time	Memory
924519		mocha	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	4 ms	1008 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
const int mx = 2e5+5;
const int inf = 1e9+1;

int n, k;
string st;

int main() {
    cin.tie(0);ios::sync_with_stdio(0);
    cin >> n >> k;
    cin >> st;
    int z, x, c, v, cj, co, ci;
    z = x = c = v = 0;
    cj = co = ci = 0;
    int ans = inf;
    while (z<n&&st[z]!='J') z++;
    x = z;
    while (x!=n&&cj<k) {
        if (st[x] == 'J') cj++;
        x++;
    }
    c = x;
    // cout << cj << " " << co << " " << ci << "\n";
    while (c!=n&&co<k) {
        if (st[c] == 'O') co++;
        c++;
    }
    v = c;
    while (v!=n&&ci<k) {
        if (st[v] == 'I') ci++;
        v++;
    }
    // cout << z << " " << x << " " << c << " " << v << " " << cj << " " << co << " " << ci << "owo\n";
    if (cj == k and co == k and ci == k) {
        ans = v-z-3*k;
    } else {
        cout << -1 << "\n";
        return 0;
    }
    for (;x<n;) {
        z++;
        while (z<n&&st[z]!='J') z++;
        cj--;
        while (x!=n&&cj<k) {
            if (st[x] == 'J') cj++;
            if (st[x] == 'O') co--;
            x++;
        }
        while (c!=n&&co<k) {
            if (st[c] == 'O') co++;
            if (st[c] == 'I') ci--;
            c++;
        }
        while (v!=n&&ci<k) {
            if (st[v] == 'I') ci++;
            v++;
        }
        if (cj == k and co == k and ci == k) {
            ans = min(ans,v-z-3*k);
        }
    }
    cout << ans << "\n";
}

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