Compilare: main.cpp: In function 'int main()': main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0;i < ciur.size();++i) ~~^~~~~~~~~~~~~ main.cpp:30:10: warning: unused variable 'ok' [-Wunused-variable] bool ok = false; ^~ main.cpp:49:9: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized] s1[p] = 'a'; ^