drumuri2.cpp: In function 'void first_dfs(int)': drumuri2.cpp:14: warning: comparison between signed and unsigned integer expressions drumuri2.cpp: In function 'void second_dfs(int)': drumuri2.cpp:25: warning: comparison between signed and unsigned integer expressions drumuri2.cpp: In function 'void topological_sort(int)': drumuri2.cpp:48: warning: comparison between signed and unsigned integer expressions drumuri2.cpp: In function 'void compute(std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >*, int)': drumuri2.cpp:55: warning: comparison between signed and unsigned integer expressions drumuri2.cpp:57: warning: comparison between signed and unsigned integer expressions drumuri2.cpp:60: warning: comparison between signed and unsigned integer expressions drumuri2.cpp: In function 'int main()': drumuri2.cpp:88: warning: comparison between signed and unsigned integer expressions drumuri2.cpp:68: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result drumuri2.cpp:69: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result drumuri2.cpp:71: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result drumuri2.cpp:73: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result