Compilare: main.cpp: In function 'int main()': main.cpp:75:32: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<std::vector<int> >::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d\n",ans.size()); ^ main.cpp:78:34: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d ",it.size()); ^ main.cpp:45:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a + 1,NMAX + 2,f); ^ main.cpp:46:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(b + 1,NMAX + 2,f); ^