Submission #838938

#	Time	Username	Problem	Language	Result	Execution time	Memory
838938		nonono	Homework (CEOI22_homework)	C++14	100 / 100	262 ms	239196 KiB

Main

#include <bits/stdc++.h>
using namespace std;

const int mxN = 5000005;

string s;
int n;

vector<vector<int>> adj(mxN);
int type[mxN];
int _min[mxN], _max[mxN];

void dfs(int u) {
    if(type[u] == -1) {
        _min[u] = 1;
        _max[u] = 1;
        return ;
    }
    
    int vL = adj[u][0];
    int vR = adj[u][1];
        
    dfs(vL);
    dfs(vR);
    
    if(type[u] == 0) {
        _min[u] = min(_min[vL], _min[vR]);
        _max[u] = _max[vL] + _max[vR];
    }
    
    if(type[u] == 1) {
        _min[u] = _min[vL] + _min[vR];
        _max[u] = min(_max[vL], _max[vR]);
    }
}

signed main() {
#define taskname ""

    if(fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }

    cin.tie(0)->sync_with_stdio(0);
    
    cin >> s;
    n = s.size();
    
    vector<int> qu;
    
    int vertex = 0, node = 0;
    for(int i = 1; i <= n; i ++) {
        if(s[n - i] == ')') {
            vertex ++ ;
            qu.push_back(vertex);
        }
        
        if(s[n - i] == '?') {
            vertex ++ ;
            node ++ ;
            qu.push_back(vertex);
            type[vertex] = -1;     
        }
        
        if(s[n - i] == '(') {
            //for(int x : qu) cout << x << " "; cout << "\n";
            
            int vL = qu.back();
            qu.pop_back();
            
            int vR = qu.back();
            qu.pop_back();
            
            int u = qu.back();
            
            adj[u].push_back(vL);
            adj[u].push_back(vR);
    
            if(s.substr(n - i - 3, 3) == "min") type[u] = 0;
            if(s.substr(n - i - 3, 3) == "max") type[u] = 1;
        }
    }
    
    dfs(1);
    cout << (node - _max[1] + 1) - _min[1] + 1 << "\n";
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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