Compilare: main.cpp: In function 'int main()': main.cpp:45:37: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<pat>::size_type {aka long unsigned int}' [-Wformat=] fprintf( fout, "%d\n", v.size() ); ^ main.cpp:46:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v.size(); i++ ) ~~^~~~~~~~~~ main.cpp:33:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d %d", &n, &k ); ^ main.cpp:35:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf( fin, "%d %d", &l, &c ); ^