Submission #1030676

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030676		mispertion	Homework (CEOI22_homework)	C++17	100 / 100	156 ms	167136 KiB

Main

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

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef long long ll;
#define int ll
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mispertion ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
#define F first
#define S second
#define getlast(s) (*s.rbegin())
#define debg cout << "OK\n"
 
const ld PI = 3.1415926535;
const int N = 3e6+10;
const int M = 1e4 + 5;
int mod = 1e9+7;
const int infi = INT_MAX;
const ll infl = LLONG_MAX;
const int P = 467743;
 
int mult(int a, int b) {
    return a * 1LL * b % mod;
}
 
int sum(int a, int b) {
    a %= mod;
    b %= mod; 
    if(a + b >= mod)
        return a + b - mod;
    if(a + b < 0)
        return a + b + mod;
    return a + b;
}
 
int binpow(int a, ll n) {
    if (n == 0)
        return 1;
    if (n % 2 == 1) {
        return mult(binpow(a, n - 1), a);
    } else {
        int b = binpow(a, n / 2);
        return mult(b, b);
    }
}

int n, tp[N], cr, l[N], r[N];
string expr;
vector<int> g[N];

void solve(){
    cin >> expr;
    int mx = sz(expr);
    expr += "$$";
    int i = 0;
    stack<int> st;
    while(i < mx){
        if(expr[i] == 'm'){
            cr++;
            if(sz(st) > 0)
                g[st.top()].pb(cr);
            st.push(cr);
            if(expr[i + 1] == 'i')
                tp[cr] = -1;
            else
                tp[cr] = 1;
            i += 4;
        }else if(expr[i] == '?'){
            n++;
            cr++;
            if(sz(st) > 0)
                g[st.top()].pb(cr);
            while(expr[i + 1] == ')'){
                st.pop();
                i++;
            }
            i += 2;
        }
    }    
    for(int v = cr; v >= 1; v--){
        if(tp[v] == 0){
            l[v] = 0;
            r[v] = 0;
        }else if(tp[v] == 1){
            r[v] = min(r[g[v][0]], r[g[v][1]]);
            l[v] = l[g[v][0]] + l[g[v][1]] + 1;
        }else{
            l[v] = min(l[g[v][0]], l[g[v][1]]);
            r[v] = r[g[v][0]] + r[g[v][1]] + 1;
        }
    }
    cout << n - l[1] - r[1] << '\n';
}

signed main() {
    mispertion;
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    return 0;
}

// coded by mispertion :)

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 13 / 13
• Subtask 4: 30 / 30
• Subtask 5: 34 / 34