pitici1.cpp: In function 'void read()': pitici1.cpp:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result pitici1.cpp:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pitici1.cpp:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result pitici1.cpp: In function 'void solve(int, int)': pitici1.cpp:43: warning: comparison between signed and unsigned integer expressions pitici1.cpp:53: warning: comparison between signed and unsigned integer expressions pitici1.cpp: In function 'void write()': pitici1.cpp:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result