Submission #1913581

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define vi vector<int>
#define vvi vector<vi>
#define vs vector<string>
#define pb push_back
#define P pair<int,int>
#define vp vector<P>
#define PP pair<int,P>
#define vpp vector<PP>
#define fi first
#define se second
#define INF (1<<30)
#define MOD 1000000007
#define REP(i,n) for(int i=0;i<n;i++)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define FOR(i,m,n) for(int i=m;i<n;i++)
#define all(x) (x).begin(),(x).end()
int main(){
    int n,m;
    cin>>n>>m;
    int ma=0;
    int sum=0;
    REP(i,m){
        int t;
        cin>>t;
        ma=max(ma,t);
        sum+=t;
    }
    cout<<max(0,ma-(sum-ma)-1)<<endl;
    return 0;
}

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Judge Result