Compilare: main.cpp: In function 'int main()': main.cpp:38:45: 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, &a, &b, &c ) ; ^ main.cpp: In function 'void sortbybit(int, int)': main.cpp:28:10: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations] f[i] = 0 ; ~~~~~^~~ main.cpp:27:18: note: within this loop for (i = 0 ; i <= VALMAX ; i++ ) ^ main.cpp:22:18: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations] f[i] += f[i-1] ; ^ main.cpp:21:18: note: within this loop for (i = 1 ; i <= VALMAX ; i++ ) ^ main.cpp:22:18: warning: array subscript is above array bounds [-Warray-bounds] f[i] += f[i-1] ; ^ main.cpp:22:10: warning: array subscript is above array bounds [-Warray-bounds] f[i] += f[i-1] ; ~~~~~^~~~~~~~~ main.cpp:28:8: warning: array subscript is above array bounds [-Warray-bounds] f[i] = 0 ; ~~~^