Compilare: main.cpp: In member function 'int Hash::find(int)': main.cpp:25:23: 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:26:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j != mat[modulo].size() ) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:7: warning: unused variable 'n' [-Wunused-variable] int n, a1, a2, a3, a4, a5, count, i, j, k, poz ; ^ main.cpp:46:56: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d%d", &a1, &a2, &a3, &a4, &a5 ) ; ^