Compilare: user.cpp: In function ‘void Solve()’: user.cpp:140: warning: comparison between signed and unsigned integer expressions user.cpp:123: warning: unused variable ‘l’ user.cpp: In function ‘int main()’: user.cpp:146: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:147: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:149: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:151: 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