virus.cpp: In function 'void solve()': virus.cpp:85: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result virus.cpp:86: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result virus.cpp: In function 'int main()': virus.cpp:108: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result virus.cpp:109: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result virus.cpp:110: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result virus.cpp:111: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccoCdfSy.o: In function `solve()': virus.cpp:(.text+0x6b): warning: the `gets' function is dangerous and should not be used.