Compilare: main.cpp: In function 'void solve(std::vector<int>&, std::vector<int>&, int&, std::vector<int>&, int&)': main.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<cc.size();i++) ~^~~~~~~~~~ main.cpp:38:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<cc.size();i++){ ~^~~~~~~~~~ main.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol_cnx.size();j++) ~^~~~~~~~~~~~~~~ main.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sum_cnx.size();i++) ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:102:49: warning: format '%d' expects argument of type 'int', but argument 4 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf (fout,"%d\n%d\n",cost_max,sol.size()); ^ main.cpp:103:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp:91:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:93:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&val[i]); ^ main.cpp:97:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^