Compilare: main.cpp: In function 'int main()': main.cpp:29:70: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] sum(fr[i&1][cif+1][(j * 10 + v[i-1] - '0') % k], fr[i&1^1][cif][j]); ~^~ main.cpp:30:42: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses] sum(fr[i&1][cif][j], fr[i&1^1][cif][j]); ~^~ main.cpp:17:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("diviz.in","r",stdin); ^ main.cpp:18:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("diviz.out","w",stdout); ^