Compilare: main.cpp: In function 'void gen_next1(int)': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < v.size() ; ++ j) ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l = 0 ; l < next1[j].size() ; l ++) ~~^~~~~~~~~~~~~~~~~ main.cpp:48:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pavare.in" , "r" , stdin); ^ main.cpp:49:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pavare.out" , "w" , stdout); ^ main.cpp:51:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d" , &n , &m , &k); ^ main.cpp:54:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &x , &y); ^