Submission #2551024

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Source Code Expand

#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
int INF = 1LL << 30;
int MOD = 1e9+7;
main(){
    string S;
    cin >> S;
    int cnt = 0,maxi = 0;
    for(auto c:S){
        if(c == '2')cnt++;
        else        cnt--;
        if(cnt < 0){
            cout << -1 << endl;
            return 0;
            
        }
        maxi = max(maxi,cnt);
    }
    if(cnt){
        cout << -1 << endl;
        return 0;
    }

    cout << maxi << endl;
}

Submission Info

Judge Result