Compilare: user.cpp: In function ‘void optim()’: user.cpp:140:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (p0 < pos[0].size() && pos[0][p0] <= coord[i]) ^ user.cpp:143:33: 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:152:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:155:47: 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:158:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:161:47: 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); ^