Submission #2530270

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define REP(i,n) for (int i=0;i<(n);i++)
#define MOD 1000000007
#define INF 1000000000009
typedef long long ll;
typedef pair<int,int> P;
#define YES(s) s?cout << "YES" << endl:cout << "NO" << endl
#define Yes(s) s?cout << "Yes" << endl:cout << "No" << endl
#define Taka(s) s?cout << "Takahashi" << endl:cout << "Aoki" << endl
//#define int ll

int main(void){
    string s;
    cin >> s;
    int f=0;
    bool ch=0;
    while(s.size()>0){
        ch=1;
        for(int i=0;i<s.size();i++){
            if(s[i]=='2'&&s[i+1]=='5'){
                s.erase(s.begin()+i,s.begin()+i+2);
                ch=0;
            }
        }
        f++;
        if(ch==1){
            cout << -1 << endl;return 0;
        }
    }
    cout << f <<endl;
  return 0;
}

Submission Info

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