Submission #1086500

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086500		toast12	JJOOII 2 (JOI20_ho_t2)	C++14	0 / 100	1 ms	348 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;
    vector<int> jpos, opos, ipos;
    for (int l = 0; l < n; l++) {
        if (s[l] == 'J') jpos.push_back(l);
        if (s[l] == 'O') opos.push_back(l);
        if (s[l] == 'I') ipos.push_back(l);
    }
    int ans = INT_MAX;
    for (int j = 0; j <= jpos.size()-k; j++) {
        int lb = jpos[j+k-1];
        auto it = lower_bound(opos.begin(), opos.end(), lb);
        if (it == opos.end()) break;
        int idx = it-opos.begin();
        lb = opos[idx+k-1];
        it = lower_bound(ipos.begin(), ipos.end(), lb);
        if (it == ipos.end()) break;
        idx = it-ipos.begin();
        int l = jpos[j], r = ipos[idx+k-1];
        ans = min(ans, (r-l+1)-(3*k));
    }
    if (ans == INT_MAX) ans = -1;
    cout << ans << '\n';
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:16:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for (int j = 0; j <= jpos.size()-k; j++) {
      |                     ~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87