Submission #1833996

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Source Code Expand

#include <algorithm>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <iostream>
#include <sstream>
#include <functional>
#include <map>
#include <string>
#include <cstring>
#include <vector>
#include <queue>
#include <stack>
#include <deque>
#include <set>
#include <list>
#include <numeric>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> P;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const ll INF = 1LL<<29;
const ll mod = 1e9+7;
#define rep(i,n) for(int (i)=0;(i)<(ll)(n);++(i))
#define repd(i,n,d) for(ll (i)=0;(i)<(ll)(n);(i)+=(d))
#define all(v) (v).begin(), (v).end()
#define pb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset((m),(v),sizeof(m))
#define chmin(X,Y) ((X)>(Y)?X=(Y),true:false)
#define chmax(X,Y) ((X)<(Y)?X=(Y),true:false)
#define fst first
#define snd second
#define UNIQUE(x) (x).erase(unique(all(x)),(x).end())
template<class T> ostream &operator<<(ostream &os, const vector<T> &v){int n=v.size();rep(i,n)os<<v[i]<<(i==n-1?"":" ");return os;}

int main(){
	ll n;
	cin>>n;
	vector<P> v(n);
	rep(i, n){
		cin>>v[i].fst;
		v[i].snd = i;
	}
	sort(all(v));
	ll res = 0;
	rep(i, n) if((v[i]+i)%2) res++;
	cout<<res<<endl;
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:51:20: error: no match for ‘operator+’ (operand types are ‘__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, long long int> > >::value_type {aka std::pair<long long int, long long int>}’ and ‘int’)
  rep(i, n) if((v[i]+i)%2) res++;
                    ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/algorithm:61,
                 from ./Main.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:341:5: note: candidate: template<class _Iterator> std::reverse_iterator<_Iterator> std::operator+(typename std::reverse_iterator<_Iterator>::difference_type, const std::reverse_iterator<_Iterator>&)
     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
     ^
/usr/include/c++/5/bits/stl_iterator.h:341:5: note:   template argument deduction/substitution failed:
./Main.cpp:51:21: note:   mismatched types ‘const std::reverse_iterator<_Iterator>’ and ‘int’
  rep(i, n) if((v[i]+i)%2) res...