Compilare: user.cpp: In function ‘void Solve()’: user.cpp:139: warning: comparison between signed and unsigned integer expressions user.cpp:122: warning: unused variable ‘l’ user.cpp: In function ‘int main()’: user.cpp:145: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:146: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:148: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:150: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Check(int, int)’: user.cpp:84: warning: ‘M1’ may be used uninitialized in this function user.cpp:84: warning: ‘M2’ may be used uninitialized in this function