Compilare: user.cpp: In function ‘int main()’: user.cpp:33:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &n, &m); ^ user.cpp:36:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &a[i]); ^ user.cpp:39:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d", &b[i]); ^ user.cpp:13:9: warning: ‘s2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(max_ending_here > max_so_far) max_so_far = max_ending_here, ksmax=kinitial; ^ user.cpp:27:18: note: ‘s2’ was declared here int l1, l2, s1, s2; ^ user.cpp:13:9: warning: ‘s1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(max_ending_here > max_so_far) max_so_far = max_ending_here, ksmax=kinitial; ^ user.cpp:27:14: note: ‘s1’ was declared here int l1, l2, s1, s2; ^