Compilare: user.cpp: In function ‘int main()’: user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<l[sum].size();k++) ^ user.cpp:31:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<l[sum].size();k++) ^ user.cpp:36:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==l[sum].size()) ^ user.cpp:12:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&s); ^ user.cpp:14:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&v[i]); ^