Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:73:48: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘ull {aka long long unsigned int}’ [-Wformat=] fprintf(o, "%ld\n",cabana(N, K, 1000000007ll)); ^ user.cpp:67:7: warning: unused variable ‘line’ [-Wunused-variable] char line[100]; ^ user.cpp:68:22: 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:72:31: 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); ^