Compilare: main.cpp: In function 'void df(int)': main.cpp:19:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[k].size();++i) { ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol[x].size();j++) ~^~~~~~~~~~~~~~ main.cpp:72:42: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d ",sol[x].size()); ^ main.cpp:74:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol[x].size();j++) { ~^~~~~~~~~~~~~~ main.cpp:48:13: warning: unused variable 'k' [-Wunused-variable] int i,j,k; ^ main.cpp:49:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&n,&m); ^ main.cpp:51:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^