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:47:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d\n", &p ) ; ^ main.cpp:93:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d", &a, &b, &e) ; ^ main.cpp:58:20: warning: 'semn' may be used uninitialized in this function [-Wmaybe-uninitialized] coef[0] += r * semn ; ~~^~~~~~