police.cpp: In function 'void dfs(int, int)': police.cpp:16: warning: comparison between signed and unsigned integer expressions police.cpp:29: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x police.cpp:29: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x police.cpp: In function 'int main()': police.cpp:58: warning: comparison between signed and unsigned integer expressions police.cpp:59: warning: comparison between signed and unsigned integer expressions police.cpp:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result police.cpp:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result