Submission #943381

#	Time	Username	Problem	Language	Result	Execution time	Memory
943381		Ahmed57	Homework (CEOI22_homework)	C++17	100 / 100	309 ms	437128 KiB

Main

#include "bits/stdc++.h"

using namespace std;
#ifdef LOCAL
#include "debug.cpp"
#else
#define debug(...)
#endif
int NODES = 0;
string s;
int L[10000001],R[10000001],nah[10000001];
int pref[10000001];
vector<int> v[10000001];
int query(int l,int r){
    return pref[r]-(l==0?0:pref[l-1]);
}
int rec(int l,int r){
    if(l==r){
        return nah[l];
    }
    NODES++;
    int p1 = rec(l+4,v[l][1]-2);
    int p2 = rec(v[l][1],r-1);
    int l1 = l+4 , r1 = v[l][1]-2;
    int l2 = v[l][1] , r2 = r-1;
    if(s[l+2]=='x'){
        R[NODES] = query(l,r)-min(query(l1,r1)-R[p1],query(l2,r2)-R[p2]);
        L[NODES] = query(l,r)-(query(l1,r1)-L[p1])-(query(l2,r2)-L[p2]);
    }else {
        L[NODES] = min(L[p1],L[p2]);
        R[NODES] = R[p1]+R[p2]-1;
    }
    return NODES;
}
signed main() {
    ios_base::sync_with_stdio(false);cin.tie(0);
    cin>>s;
    int i = 0;
    stack<int> st;
    while(i<s.size()){
        if(s[i]=='m'){
            if(!st.empty()){
                v[st.top()].push_back(i);
            }
            st.push(i);
            i+=4;
        }if(s[i]=='?'){
            if(!st.empty()){
                v[st.top()].push_back(i);
            }
            i++;
        }if(s[i]==')'){
            st.pop();
            i++;
        }if(s[i]==',')i++;
    }
    for(int i = 0;i<s.size();i++){
        if(s[i]=='?'){
            pref[i] = 1;
            L[NODES] = 1;
            R[NODES] = 1;
            nah[i] = NODES;
            NODES++;
        }
        if(i)pref[i]+=pref[i-1];
    }
    int nah = rec(0,s.size()-1);
    cout<<R[nah]-L[nah]+1<<endl;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:40:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     while(i<s.size()){
      |           ~^~~~~~~~~
Main.cpp:57:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i = 0;i<s.size();i++){
      |                   ~^~~~~~~~~

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