missing_number_1083.cpp (156B)
1 #include <iostream> 2 3 int main() { 4 long long n, m, sum{0}; 5 std::cin >> n; 6 while (std::cin >> m) 7 sum += m; 8 std::cout << n*(n+1)/2 - sum << std::endl; 9 }
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missing_number_1083.cpp (156B)
1 #include <iostream> 2 3 int main() { 4 long long n, m, sum{0}; 5 std::cin >> n; 6 while (std::cin >> m) 7 sum += m; 8 std::cout << n*(n+1)/2 - sum << std::endl; 9 }