Compilare: main.cpp: In function 'void add(HugeN&, const HugeN&)': main.cpp:20:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.nr.size() || i<b.nr.size() || t>0;i++){ ~^~~~~~~~~~~~ main.cpp:20:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.nr.size() || i<b.nr.size() || t>0;i++){ ~^~~~~~~~~~~~ main.cpp:21:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<a.nr.size()){ ~^~~~~~~~~~~~ main.cpp:24:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<b.nr.size()){ ~^~~~~~~~~~~~ main.cpp:27:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<a.nr.size()) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("indep.in" , "r" , stdin); ^ main.cpp:40:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("indep.out" , "w" , stdout); ^ main.cpp:41:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:45:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d" , &x); ^