Submission #151590

#	Time	Username	Problem	Language	Result	Execution time	Memory
151590		leduykhongngu	HicCup (FXCUP4_hiccup)	C++17	24 / 100	36 ms	14328 KiB

hiccup

#include <cstdio>
#include <iostream>
#include <cstring>
#include <stack>
#include <cassert>
#include <vector>
#include <algorithm>
using namespace std;

string S = "";
int n;
int pre[1000005], sum[1000005];
vector<int> End;
bool Check(int lim)
{
    int last = S.length() - 1;
    int cnt = 0;
    for (int R : End) {
        cnt += sum[last] - sum[R - 1];
        if (cnt < lim) return false;
        cnt -= lim;
        last = R;
    }
    return true;
}

int HicCup(std::string tmp)
{
    S = tmp;
    stack<int> st;
    if (tmp[0] == '!') return -1;
    for (int i = 0; i < tmp.length(); ++i) {
        sum[i] = sum[i-1];
        if (S[i] == '!') {
            if (i > 0 && S[i-1] == 'H') return -1; 
            ++sum[i];
            continue;
        }
        if (S[i] == 'H') {
            st.push(i);
        }
        else {
            assert(S[i] == 'C');
            if (st.size() == 0) return -1;
            int L = st.top();
            pre[i] = L;
            st.pop();
            End.push_back(i);
        }
    }
    if (st.size()) return -1;
    reverse(End.begin(), End.end());
    int lef = 0, rig = S.length(), ans = -1;
    while (lef <= rig)
    {
        int mid = (lef + rig)/2;
        if (Check(mid))
        {
            ans = max(ans, mid);
            lef = mid + 1;
        }
        else rig = mid - 1;
    }
    return ans;
}

Compilation message (stderr)

hiccup.cpp: In function 'int HicCup(std::__cxx11::string)':
hiccup.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < tmp.length(); ++i) {
                     ~~^~~~~~~~~~~~~~

• Subtask 1: 24 / 24
• Subtask 2: 0 / 76