Compilare: main.cpp: In function 'bool check(int)': main.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 2; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp:50:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < sol.size(); j++) ~~^~~~~~~~~~~~ main.cpp:30:16: warning: unused variable 'j' [-Wunused-variable] int i, j; ^ main.cpp: In function 'int main()': main.cpp:83:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < m; ++i) ~~^~~ main.cpp:88:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i < n; ++i) ~~^~~ main.cpp:89:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (check(i) && sol.size() == n) ~~~~~~~~~~~^~~~