Submission #1904672

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Source Code Expand

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

#define int long long

#define rep(i,n) for(int i=0;i<(n);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
#define fi first
#define se second
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;

template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

signed main(){
    int K,T;
    cin>>K>>T;
    vint A(T);rep(i,T)cin>>A[i];


    int ma=max_element(all(A))-A.begin();

    int sum=accumulate(all(A),0ll);
    if(sum-A[ma]+1>=A[ma]){
        cout<<0<<endl;
    }
    else{
        cout<<A[ma]-(sum-A[ma]+1)<<endl;
    }
    return 0;
}

Submission Info

Judge Result