scor2.cpp: In function 'void dfs(int)': scor2.cpp:41: warning: comparison between signed and unsigned integer expressions scor2.cpp: In function 'int main()': scor2.cpp:79: warning: suggest parentheses around '&&' within '||' scor2.cpp:69: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result scor2.cpp:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result scor2.cpp:72: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result scor2.cpp:74: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccoYLdCA.o: In function `main': scor2.cpp:(.text+0x418): warning: the `gets' function is dangerous and should not be used.