Compilare: main.cpp: In function 'int main()': main.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<t[nr].size();j++) ~^~~~~~~~~~~~~ main.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j!=t[nr].size()) ~^~~~~~~~~~~~~~ main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j!=t[nr].size()) fout<<1<<"\n"; ~^~~~~~~~~~~~~~ main.cpp:29:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (a==3) ^