Compilare: user.cpp: In function ‘int main()’: user.cpp:63:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= M;i++) ^ user.cpp:93:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1;i <= N;i++) ^ user.cpp:94:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1;j <= N;j++) ^ user.cpp:115:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (e > V.size() - it) ^ user.cpp: In function ‘int Read()’: user.cpp:32:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:34:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:39:23: 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:46:35: 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:47:37: 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:65:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&Op); ^ user.cpp:67:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&Op); ^