Compilare: user.cpp: In function ‘void dfs(int, int, int*)’: user.cpp:18:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<mat[nod].size();i++) ^ user.cpp:16:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=1; ^ user.cpp: In function ‘int main()’: user.cpp:61:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int o=0;o<mat[ndfin].size();o++) ^ user.cpp:71:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<cost[ndfin].size();k++) ^ user.cpp:60:13: warning: unused variable ‘mt’ [-Wunused-variable] int mt=c; ^ user.cpp:97:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<cost[i].size();j++) ^ user.cpp:108:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k>=cost[x].size()) ^