matriosca.cpp: In function 'int main()': matriosca.cpp:18: warning: comparison between signed and unsigned integer expressions matriosca.cpp:20: warning: comparison between signed and unsigned integer expressions matriosca.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result matriosca.cpp:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result matriosca.cpp:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result matriosca.cpp:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result matriosca.cpp: In function 'void FIND(int)': matriosca.cpp:28: warning: comparison between signed and unsigned integer expressions