Eroare de compilare: main.cpp: In function 'int f(int, int)': main.cpp:18:18: error: 'k' was not declared in this scope 18 | if (d <= k) s += dr - st + 1; | ^ main.cpp:18:21: error: 's' was not declared in this scope 18 | if (d <= k) s += dr - st + 1; | ^ main.cpp:27:13: error: 's' was not declared in this scope 27 | s += dr - st + 1; | ^ main.cpp:31:32: error: 's' was not declared in this scope 31 | return (n * (n + 1)) / 2 - s; | ^ main.cpp:12:15: warning: unused variable 'sum' [-Wunused-variable] 12 | long long sum; | ^~~ Non zero exit status: 1