Compilare: main.cpp: In function 'int main()': main.cpp:265:46: warning: format '%u' expects argument of type 'unsigned int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(fout, "%u\n", ans[unde[1]].size()); ^ main.cpp: In function 'char nextch()': main.cpp:31:63: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] if (pos == BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos = 0; ^