s.c (379B)
1 #include <stdio.h> 2 #include <stdlib.h> 3 4 void solve() 5 { 6 unsigned int n; 7 unsigned int cur; 8 unsigned int prev = 0; 9 unsigned long long res = 0; 10 scanf("%u", &n); 11 12 for (int i = 0; i < n; i++) { 13 scanf("%u", &cur); 14 res += (cur < prev) * (prev - cur); 15 prev = cur < prev ? prev : cur; 16 } 17 18 printf("%llu\n", res); 19 20 return; 21 } 22 23 int main() 24 { 25 int t = 1; 26 while (t--) 27 solve(); 28 }