Compilare: main.cpp: In function 'bool ok(int)': main.cpp:53:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tip[k].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tip[1].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:58:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < tip[2].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < tip[1].size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:104:9: warning: unused variable 'st' [-Wunused-variable] int st = 0, dr = n; ^~