Compilare: user.cpp: In function ‘int comb(int, int)’: user.cpp:52:22: warning: unused variable ‘cnt’ [-Wunused-variable] int j, f1, f2, f3, cnt; ^ user.cpp: In function ‘int main()’: user.cpp:82:30: warning: unused variable ‘coeff’ [-Wunused-variable] int n, e, fr, rat, k, del, coeff; ^ user.cpp:87:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &fr, &rat, &k); ^ user.cpp:90:5: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (c == '\n') { ^