Compilare: main.cpp: In function 'int euler(int)': main.cpp:36:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:86:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[x].size();j++) ~^~~~~~~~~~~~~~ main.cpp:97:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<sol[y].size();j++) ~^~~~~~~~~~~~~~