Compilare: main.cpp: In function 'std::vector<long long int> multiply(std::vector<long long int>, std::vector<long long int>)': main.cpp:42:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; (i<c.size()) && (c[i]>0); i++){ ~^~~~~~~~~ main.cpp: In function 'std::vector<long long int> add(std::vector<long long int>, std::vector<long long int>)': main.cpp:68:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++){ ~^~~~~~~~~ main.cpp:69:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<b.size()){ ~^~~~~~~~~ main.cpp:76:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=a.size(); i<b.size(); i++){ ~^~~~~~~~~ main.cpp:82:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; (i<c.size()) && (c[i]>0); i++){ ~^~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:110:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<c.size(); i++){ ~^~~~~~~~~ main.cpp:100:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tort.in", "r", stdin); ^ main.cpp:101:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tort.out", "w", stdout); ^