Compilare: main.cpp: In function 'int main()': main.cpp:41:13: warning: unused variable 'ct' [-Wunused-variable] int ct = 1; ^~ main.cpp:63:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long long ii = 0; ii < pr.size(); ++ii) ~~~^~~~~~~~~~~ main.cpp:81:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < v[j].size(); ++k) ~~^~~~~~~~~~~~~