제출 #149844

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
149844		Torat (#200)	HicCup (FXCUP4_hiccup)	C++17	24 / 100	84 ms	63900 KiB

hiccup

#include <bits/stdc++.h>
#include "hiccup.h"
//~ #include "grader.cpp"
using namespace std;

const int N = 1000001;

int n;
string s;
vector <int> h, v[N], g[N];

bool valid(){
    int o = 0;
    for(auto &i : s){
        o += i == 'H';
        o -= i == 'C';
        if(o < 0) return 0;
    }
    if(o) return 0;
    for(auto &i : s){
        if(i == 'H') o = 0;
        else if(i == 'C') o = 1;
        else if(o == 0) return 0;
    }
    return 1;
}
bool check(int x){
    for(int i = 0 ; ; i++){
        if((int)v[i].size() == 0) break;
        g[i] = v[i];
    }
    for(int i = n - 1 ; i >= 0 ; i--){
        if(s[i] == 'C'){
            int cur = x;
            while(cur > 0 && g[h[i]].size() && g[h[i]].back() > i){
                g[h[i]].pop_back();
                cur--;
            }
            if(cur) return 0;
        }
    }
    return 1;
}
int HicCup(std::string S) {
    s = S;
    n = s.size();
    if(!valid() || s == string(n, '!')) return -1;
    h.resize(n);
    h[0] = 1;
    for(int i = 1 ; i < n ; i++){
        h[i] = h[i - 1];
        if(s[i] == 'H') h[i]++;
        else if(s[i] == 'C') h[i]--;
        else v[h[i]].push_back(i);
    }
    int l = 0, r = n;
    while(l <= r){
        int mid = (l + r) / 2;
        if(check(mid)) l = mid + 1;
        else r = mid - 1;
    }
    return l - 1;
}

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