apm.cpp: In function 'void dfs(int, int)': apm.cpp:41: warning: comparison between signed and unsigned integer expressions apm.cpp: In function 'void solve()': apm.cpp:102: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x apm.cpp:102: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x apm.cpp:113: warning: comparison between signed and unsigned integer expressions