Compilare: main.cpp: In function 'int ok(ll)': main.cpp:67:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i][j]>a[pos]){ ~~~~~~~^~~~~~~ main.cpp:78:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i][j]<a[pos]) return 0; ~~~~~~~^~~~~~~ main.cpp: In function 'int main()': main.cpp:16:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pic.in", "r", stdin); ^ main.cpp:17:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pic.out", "w", stdout); ^ main.cpp:18:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &p); ^ main.cpp:19:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r); /// nr randuri ^ main.cpp:22:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^