Compilare: main.cpp:3:22: warning: multi-character character constant [-Wmultichar] #pragma GCC optimize('O3') ^~~~ main.cpp:3:22: warning: '#pragma GCC optimize' is not a string or number [-Wpragmas] main.cpp: In function 'int main()': main.cpp:69:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod][0].size();i++){ ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int cit()': main.cpp:20:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^ main.cpp:27:33: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^ main.cpp: In function 'int main()': main.cpp:48:25: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(BUFF,1,LEN,fi); ^