Can anyone tell me which one is better option and why?

1 Using vector and then sort the vector .

2. Using map/multimap.

Simple Solution using vector

When you'll be fix this problem?

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Solution of Matched Brackets

Simple Solution of Voters List using Vector and Set.

The Simple Solution of Video Game (ZCO 2014: India)

Solution of Lead Game

#include<iostream>

#include<bits/stdc++.h>

using namespace std;

int main(){

int n,i,p1_total=0,p2_total=0,p1,p2,mx_lead=0,tmp,winner;

cin>>n;

for(i=0; i<n; i++)

{

cin>>p1>>p2;

p1_total += p1;

p2_total += p2;