Compilare: user.cpp: In function ‘void join(int)’: user.cpp:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < aint[st].size() && j < aint[dr].size()) ^ user.cpp:21:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < aint[st].size() && j < aint[dr].size()) ^ user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < aint[st].size()) ^ user.cpp:31:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < aint[dr].size()) ^ user.cpp: In function ‘int main()’: user.cpp:78:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:81:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &v[i].x, &v[i].y); ^ user.cpp:87:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &m); ^ user.cpp:92:52: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &x1, &y1, &x2, &y2); ^