Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:37:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind.top()<G[S.top()].size()) ^ user.cpp: In function ‘int main()’: user.cpp:56:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&N,&K); ^ user.cpp:61:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&T[i].val); ^ user.cpp:72:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=K;i++){fscanf(f,"%d",&Q[i].val);Q[i].pos=i;assert(Q[i].val<=1000000000);} ^