Submission #849293

#	Time	Username	Problem	Language	Result	Execution time	Memory
849293		mickey080929	Toilets (JOI16_toilets)	C++17	100 / 100	19 ms	8648 KiB

toilets

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")

using namespace std;
typedef long long ll;

ll N, M;
vector<pair<string,ll>> v;

int main() {
    ios_base :: sync_with_stdio(false);
    cin.tie(NULL);
    cin >> N >> M;
    ll male = 0;
    for (ll i=0; i<M; i++) {
        string s;
        ll rep;
        cin >> s >> rep;
        male += count(s.begin(), s.end(), 'M') * rep;
        reverse(s.begin(), s.end());
        v.emplace_back(s, rep);
    }
    if (male > N) {
        cout << "-1";
        return 0;
    }
    reverse(v.begin(), v.end());
    M = (ll) v.size();
    ll val = 0;
    ll ans = 0;
    for (ll i=0; i<M; i++) {
        auto &[s, rep] = v[i];
        ll sum = 2 * count(s.begin(), s.end(), 'M') - (ll) s.size();
        for (ll j=0; j<s.size(); j++) {
            if (s[j] == 'M') val ++;
            else val --;
            ans = max(ans, val - 1);
            ans = max(ans, (val + sum*(rep-1)) - 1);
        }
        val += sum * (rep-1);
    }
    cout << ans;

    return 0;
}

Compilation message (stderr)

toilets.cpp: In function 'int main()':
toilets.cpp:36:23: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         for (ll j=0; j<s.size(); j++) {
      |                      ~^~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 22 / 22
• Subtask 3: 64 / 64