Compilare: user.cpp: In function ‘int main()’: user.cpp:92:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < _H.size() ; ){ ^ user.cpp:95:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < _H.size() && _H[j].y == _H[i].y && _H[j].x0 <= x1 ; ++ j) ^ user.cpp:103:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < V.size();){ ^ user.cpp:105:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < V.size() && V[j].x == V[i].x && V[j].y0 <= y1 ; ++ j) ^ user.cpp:113:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < H.size() ; ++ i){ ^ user.cpp:114:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i > 0 && i < H.size() && H[i] == H[i-1]) ^ user.cpp:116:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1 ; j < H.size() ; ++ j){ ^ user.cpp:117:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j > 0 && j < H.size() && H[j] == H[j-1]) ^