ProgramAlgTrain/20240823/十四届蓝桥比赛/主要成分.cpp

#include<iostream>
#include<map>
using namespace std;
typedef long long ll;

#ifdef OI
#define PV(v){cout<<#v<<" : "<<(v)<<endl;}
#else
#define PV(v)
#endif

int n;
map<ll,int> m;
ll readint();

int main(){
    ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    n=readint();
    for(int i=1;i<=n;i++){
        m[readint()]++;
    }
    int max_m=INT_MIN;
    ll max_dir = -1;
    for(auto i :m){
        if(max_m<i.second){
            max_m=i.second;
            max_dir=i.first;
        }
    }
    if(max_m>n/2){
        cout<<max_dir<<endl;
    }else{
        cout<<"No"<<endl;
    }
}

ll readint(){
    int x=0,w=1;
    char ch=0;
    while(!isdigit(ch)){
        if(ch=='-')w=-1;
        ch=getchar();
    }
    while(isdigit(ch)){
        x=x*10+(ch-'0');
        ch=getchar();
    }
    return x*w;
}