Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:24:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[k].size(); i++) ^ user.cpp: In function ‘int flow(int, int)’: user.cpp:43:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[dest].size(); i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:72:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[k].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:120:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) ^