Compilare: main.cpp: In function 'int main()': main.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ni; i++) { ~~^~~~ main.cpp:44:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nz; i++) { ~~^~~~ main.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ni; i++) { ~~^~~~ main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < nz; i++) { ~~^~~~ main.cpp:37:78: warning: unused variable 'aa' [-Wunused-variable] unsigned long long int v[2000], w[2000], ni, nz, x, y, a = 0, b, ca, cb, aa; ^~