Compilare: user.cpp: In function ‘bool Try(int)’: user.cpp:100:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind_1 = 0; ind_1 < act.size(); ind_1++){ ^ user.cpp:101:58: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int ind_2 = ind_1 + 1; ind_2 < act.size(); ind_2++) { ^ user.cpp:83:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int main()’: user.cpp:116:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robotics.in","r",stdin); ^ user.cpp:117:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robotics.out","w",stdout); ^ user.cpp:119:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&t); ^ user.cpp: In member function ‘void Robot::read()’: user.cpp:21:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&type); ^