Compilare: main.cpp: In member function 'long long int Hash::find(long long int)': main.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; (j != mat[modulo].size() && mat[modulo][j].val != x ) ; j++ ) ; ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:25:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < mat[modulo].size() ) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:44:19: warning: variable 'ccoef' set but not used [-Wunused-but-set-variable] long long semn, ccoef, r, p, a, b, e, i, j, coun, poz, ok ; ^~~~~ main.cpp:46:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld\n", &p ) ; ^ main.cpp:92:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld%lld%lld", &a, &b, &e) ; ^ main.cpp:76:37: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] coef[3] += ( r + (ok == 0 ) ) * semn ; ~~~~~~~~~~~~~~~~~~~^~~~~~