Compilare: main.cpp: In function 'void afisare(int)': main.cpp:44:37: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d " , ans[i].size()); ^ main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0 ; j < ans[i].size() ; j ++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:52:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.in" , "r" , stdin); ^ main.cpp:53:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.out" , "w" , stdout); ^ main.cpp:55:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &n , &m); ^ main.cpp:58:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d" , &u , &v); ^