Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++ i) { ^ user.cpp: In function ‘void compute_dp(int)’: user.cpp:101:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < paths_which_pass[node].size(); ++ i) ^ user.cpp:107:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++ i) ^ user.cpp:108:71: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < paths_which_pass[graph[node][i]].size(); ++ j) ^ user.cpp:116:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < paths_which_start[node].size(); ++ i) { ^ user.cpp:139:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++ i) { ^