https://gateoverflow.in/blog/2117/iit-bombay-mtech-ra-admissions-process-experience-2017

election.cpp

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

bool cmp(pair<int,int> a, pair<int,int> b){
	return a.second> b.second;
}

void find_w(map<int,int> m){
	vector<pair<int,int>> arr;
	for(auto i=m.begin();i!=m.end();i++){
		arr.push_back(make_pair(i->first,i->second));
	}
	sort(arr.begin(),arr.end(),cmp);
	
	cout<<arr[0].first<<endl;
}

int main() {
	map<int, int> vote;
	int n;
	cin>>n;
	for(int i=0;i<n;i++){
		int temp;
		cin>>temp;
		if(vote.find(temp)!=vote.end()){
			vote[temp] = vote[temp] +1;
		}
		else{
			vote[temp] = 1;
		}
	}
	
	find_w(vote);
	return 0;
}

graph.cpp

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

int main() {
	// your code goes here
	int n,x,y;
	cin>>n;
	vector<pair<int, int>> edges;
	map<int, int> degree;
	for(int i=0;i<n;i++){
		cin>>x>>y;
		edges.push_back(make_pair(x,y));
		
		if(degree.find(x)!=degree.end()){
			degree[x] = degree[x] +1;
		}
		else{
			degree[x] = 1;
		}
		
		if(degree.find(y)!=degree.end()){
			degree[y] = degree[y] +1;
		}
		else{
			degree[y] = 1;
		}
	}
	
	// for(auto it:degree){
	// 	cout<<it.first<<"  "<<it.second<<endl;
	// }
	int k;
	cin>>k;
	int count = 0;
	for(auto it: edges){
		if(degree[it.first]<k && degree[it.second]<k){
			// cout<<it.first<<"  "<<it.second<<endl;
			count++;
		}
	}
	cout<<count<<endl;
	return 0;
}

reverseword.cpp

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

string reverse(string demo){
	int n = demo.length();
	for(int i=0;i<n/2;i++){
		char temp = demo[i];
		demo[i] = demo[n-1-i];;
		demo[n-1-i] = temp;
	}	
	return demo;
}

void reverse_word(string temp){
	vector<string> reversed;
	string str = "";
	for(auto ch: temp){
		if(ch==' '){
			reversed.push_back(reverse(str));
			str = "";
		}
		else{
			str = str+ ch;
		}
	}
	str = reversed[0];
	for(int i=1;i<reversed.size();i++){
		str = str+' '+reversed[i];
	}
	cout<<str<<endl;
}

int main() {
	// your code goes here
	int n;
	cin>>n;
	for(int i=0;i<=n;i++){
		string temp;
		getline(cin, temp);
		// cout<<temp<<endl;
		reverse_word(temp+' ');
	}
	return 0;
}