Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:32:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d\n",&n,&m,&k); ^ user.cpp:63:34: warning: iteration 54 invokes undefined behavior [-Waggressive-loop-optimizations] if (sum+d[j][lmax-i+1]>=k){ ~~~~~~~~~~~~~^ user.cpp:62:19: note: within this loop for (j=1;j<=55;j++){ ~^~~~ user.cpp:68:9: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (x<='z'-'a'+1) ^~