dragoni.cpp: In function 'void do2()': dragoni.cpp:50: warning: unused variable 'cnt' dragoni.cpp: In function 'int main()': dragoni.cpp:89: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dragoni.cpp:90: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dragoni.cpp:92: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dragoni.cpp:94: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result dragoni.cpp:99: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result