Compilare: user.cpp: In function ‘int main()’: user.cpp:108:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (it = 1;it < V.size();it++) ^ user.cpp:112:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (e > (V.size() - it)) ^ user.cpp:120:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (it == V.size()) ^ user.cpp: In function ‘int Read()’: user.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:33:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:38:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp: In function ‘int main()’: user.cpp:45:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot3.in","r",stdin); ^ user.cpp:46:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot3.out","w",stdout); ^ user.cpp:64:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c%c",&Op,&Op); ^