Compilare: main.cpp: In function 'int main()': main.cpp:24:15: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses] memset (v[i + 1 & 1], 0, sizeof (v[i + 1 & 1])); ~~^~~ main.cpp:24:40: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses] memset (v[i + 1 & 1], 0, sizeof (v[i + 1 & 1])); ~~^~~ main.cpp:26:13: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses] add (v[i + 1 & 1][(j * 10 + x) % k], v[i & 1][j]); ~~^~~ main.cpp:27:13: warning: suggest parentheses around '+' in operand of '&' [-Wparentheses] add (v[i + 1 & 1][j], v[i & 1][j]); ~~^~~ main.cpp:15:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("mult.in", "r", stdin); ^ main.cpp:16:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("mult.out", "w", stdout); ^ main.cpp:17:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &n, &k); ^ main.cpp:19:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^ main.cpp:23:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^