Compilare: user.cpp: In function ‘void optim()’: user.cpp:148:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p0 < pos[0].size() && pos[0][p0] <= coord[i]) ^ user.cpp:153:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p1 < pos[1].size() && pos[1][p1] <= coord[i]) ^ user.cpp: In function ‘int main()’: user.cpp:164:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:167:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &duck[i].x, &duck[i].y); ^ user.cpp:170:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:173:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &wall[i].x, &wall[i].y); ^