Compilare: user.cpp: In function ‘int main()’: user.cpp:65:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d ", &n, &m); ^ user.cpp:66:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(s, MAXM + 2, in); ^ user.cpp:81:18: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(i * a + j * b == m){ ^ user.cpp:79:16: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i = 1; i * a < m; i++){ ^