Compilare: main.cpp: In function 'int main()': main.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].size();j++){ ~^~~~~~~~~~~~ main.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(nr==v[i].size()) { a[++m]=i; fr[i]=1; } ~~^~~~~~~~~~~~~ main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[a[i]].size();j++){ ~^~~~~~~~~~~~~~~ main.cpp:48:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[a[i]].size();j++){ ~^~~~~~~~~~~~~~~ main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[a[i]].size();j++){ ~^~~~~~~~~~~~~~~