zone.cpp: In function 'void neighbours(int, int)': zone.cpp:23: warning: suggest explicit braces to avoid ambiguous 'else' zone.cpp: In function 'void new_fill(int)': zone.cpp:38: warning: comparison between signed and unsigned integer expressions zone.cpp: In function 'int main()': zone.cpp:76: warning: comparison between signed and unsigned integer expressions zone.cpp:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result zone.cpp:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result zone.cpp:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result zone.cpp:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result zone.cpp:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result