Increasing Array

input/code.cpp: In function 'int main()':
input/code.cpp:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
input/code.cpp:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &curValue);
         ~~~~~^~~~~~~~~~~~~~~~~~~

#include <cstdio>
#include <vector>
 
using namespace std;
int n;
 
int main() {
    scanf("%d", &n);
 
    long long int curValue = 0, lastValue = 0, ops = 0;
    for (int i=0; i<n; i++) {
        scanf("%lld", &curValue);
        if (curValue < lastValue) {
            ops += lastValue - curValue;
        } else 
            lastValue = curValue;
    }    
    printf("%lld", ops);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED