Submission #613213

#	Time	Username	Problem	Language	Result	Execution time	Memory
613213		czhang2718	HicCup (FXCUP4_hiccup)	C++17	0 / 100	464 ms	34872 KiB

hiccup

// #include "hiccup.h"
using namespace std;
#include "bits/stdc++.h"

const int N=1e6+1;
vector<int> adj[N];
int cnt[N];
int X;
bool bad;

void dfs(int x, int &c){
	c+=cnt[x];
	for(int i=adj[x].size()-1; i>=0; i--){
		int k=adj[x][i];
		dfs(k, c);
	}
	// cout << x << " have " << c << "\n";
	c-=X;
	if(x && c<0) bad=1;
}

int HicCup(std::string S) {
	int n = S.size();

	S='-'+S;
	stack<int> par;
	par.push(0);
	int prv=-1;
	for(int i=1; i<=n; i++){
		if(S[i]=='!'){
			if(prv==-1) return -1;
			cnt[prv]++;
			// cout << "cnt[" << prv << "]++\n";
			continue;
		}
		if(S[i]=='C'){
			if(par.size()<2) return -1;
			int p=par.top(); par.pop();
			adj[par.top()].push_back(p);
			// cout << "par " << p << " = " << par.top() << "\n";
			prv=p;
		}
		else{
			par.push(i);
		}
	}

	auto check=[&](int x){
		X=x;
		bad=0;
		int c=0;
		dfs(0, c);
		return !bad;
	};

	int x=0;
	for(int i=19; i>=0; i--){
		if(x+(1<<i)<n && check(x+(1<<i))) x+=(1<<i);
	}
	// check(2);
	if(!check(x)) return -1;
	return x;
}

// int main(){
// 	string s;
// 	cin >> s;
// 	cout << HicCup(s);
// }

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