Compilare: user.cpp: In function ‘void main2()’: user.cpp:59:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<loc[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:137:28: 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:143:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&a,&b,&c); ^ user.cpp:161:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&a,&b,&c); ^