Submission #149340

#	Time	Username	Problem	Language	Result	Execution time	Memory
149340		From The Sky (#200)	HicCup (FXCUP4_hiccup)	C++17	24 / 100	169 ms	5460 KiB

hiccup

#include "hiccup.h"
#include <algorithm>
#include <string>
#include <vector>
#include <stack>
using namespace std;

int HicCup(std::string S) {
	int N = S.size();
	int mask = 0;
	int bal = 0;
	for(int i=0; i<N; i++){
		if(S[i] == '!' && mask != 3) return -1;
		if(S[i] == 'H') bal++, mask |= 1;
		if(S[i] == 'C') bal--, mask |= 2;
		if(bal < 0) return -1;
	}
	if(bal > 0) return -1;
	int l=1, r=N, res=0;
	while(l<=r){
		int mid=(l+r)/2;
		stack<int> st;
		for(int i=0; i<N; i++){
			if(S[i] == 'C'){
				st.push(0);
			} else if(S[i] == '!'){
				if(st.size()){
					int x = st.top();
					st.pop();
					x++;
					if(x < mid){
						st.push(x);
					}
				}
			}
		}
		if(st.empty()) res = mid, l = mid+1;
		else r = mid-1;
	}
	return res;
}

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