Submission #845519

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Source Code Expand

#include <cstdio>
#include <algorithm>
#include <cassert>
#include <map>
using namespace std;
const int N = 1000500;
typedef long long llong;
int A[N];

int X[N];
int Y[N];

int main() {
    int n;
    scanf("%d", &n);
    int ans = 0;
    map<int, int> M;
    for (int i = 0; i < n; i++) {
        scanf("%d", &A[i]);
        M[A[i]];
    }

    int pt = 0;
    for (map<int, int>::iterator it = M.begin(); it != M.end(); it++)
        it->second = pt++;
    for (int i = 0; i < n; i++) {
        A[i] = M[A[i]];
        X[i] = A[i] % 2;
        Y[i] = i % 2;
        ans += X[i] != Y[i];
    }
    assert(ans % 2 == 0);
    printf("%d\n", ans / 2);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:15:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
                           ^

Judge Result