Compilare: user.cpp: In function ‘int main()’: user.cpp:61:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ap[x].size();i++) ^ user.cpp: In function ‘int dist(int)’: user.cpp:31:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:39:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&T); ^ user.cpp:43:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d%d%d",&n,&d,&c,&v); ^ user.cpp:49:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d%d",&m[i].x,&m[i].y); ^