visul.cpp: In function 'int main()': visul.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result visul.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result visul.cpp:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result visul.cpp:25: warning: array subscript is above array bounds visul.cpp:26: warning: array subscript is above array bounds visul.cpp:27: warning: array subscript is above array bounds visul.cpp:28: warning: array subscript is above array bounds