Compilare: main.cpp: In function 'void dfs_down(int, int)': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs_upin(int, int)': main.cpp:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:65:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void dfs_upout(int, int)': main.cpp:89:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:108:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[tt].size() ; i++){ ~~^~~~~~~~~~~~~~ main.cpp:126:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0 ; i < v[nod].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:145:25: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ main.cpp:147:44: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&x,&y,&a,&b); ^ main.cpp: In function 'void dfs_upout(int, int)': main.cpp:116:84: warning: 'c_in' may be used uninitialized in this function [-Wmaybe-uninitialized] up_out[nod] = max(up_out[nod] , down_out[vecin] + c1 + down_in[tt] + c_in - ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~