Compilare: user.cpp: In function ‘bool check1(std::vector<sp>, int)’: user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp:25:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp: In function ‘bool check2(std::vector<sp>, int)’: user.cpp:34:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();i++) ^ user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^ user.cpp:53:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^ user.cpp:62:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^ user.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) ^ user.cpp:33:27: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int x1=50000,y1=50000,x2,y2; ^ user.cpp:73:34: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i].x<x2-L||v[i].y<y2-L) ^