Compilare: main.cpp: In function 'int main()': main.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v.size(); ++j) ~^~~~~~~~~ main.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[j].size(); ++i) ~^~~~~~~~~~~~ main.cpp:41:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==a.size()) ~^~~~~~~~~~ main.cpp:48:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(okk||k==a.size()) ~^~~~~~~~~~ main.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); ++i) ~^~~~~~~~~ main.cpp:59:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==v[j].size()) ~^~~~~~~~~~~~~ main.cpp:66:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(okk||k==v[j].size()) ~^~~~~~~~~~~~~ main.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); ++i) ~^~~~~~~~~