Compilare: main.cpp: In function 'int main()': main.cpp:19:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<a[i].size(); j++) ~^~~~~~~~~~~~ main.cpp: In function 'void desc()': main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[nr].size(); i++) ~^~~~~~~~~~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<g[a[nr][i]].size(); j++) ~^~~~~~~~~~~~~~~~~~~ main.cpp:37:10: warning: unused variable 'ok' [-Wunused-variable] bool ok=1; ^~