Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:34:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < r[x].size(); ++ i) ^ user.cpp: In function ‘void relabel(int)’: user.cpp:100:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < r[u].size(); i ++) ^ user.cpp: In function ‘void discharge(int)’: user.cpp:115:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < r[u].size() && excess[u] > 0) ^ user.cpp: In function ‘void pushRelabel(int, int)’: user.cpp:137:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int u = 0; u < r[S].size(); u++) ^ user.cpp: In function ‘void read()’: user.cpp:41:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:46:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &z); ^