cses

cses solutions in pure c
git clone git://git.superpozycja.net/cses
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s.c (305B)

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