Compilare: user.cpp: In function ‘ull cabana(ull, ull, ull)’: user.cpp:55:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = c + 1; i <= p; ++i) { ^ user.cpp: In function ‘int main(int, char**)’: user.cpp:72:49: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 3 has type ‘ull {aka long long unsigned int}’ [-Wformat=] fprintf(o, "%ull\n",cabana(N, K, 1000000007ll)); ^ user.cpp:66:7: warning: unused variable ‘line’ [-Wunused-variable] char line[100]; ^ user.cpp:67:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(i, "%d\n",&T); ^ user.cpp:71:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(i, "%d %d\n", &N, &K); ^