Compilare: main.cpp: In function 'void erase(int)': main.cpp:34:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<v.size() && v[i]!=t[k-1]) i++; ~^~~~~~~~~ main.cpp:35:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<v.size()) ~^~~~~~~~~ main.cpp:42:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(2*i+1<v.size() && v[2*i+1]<v[j]) j=2*i+1; ~~~~~^~~~~~~~~ main.cpp:43:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(2*i+2<v.size() && v[2*i+2]<v[j]) j=2*i+2; ~~~~~^~~~~~~~~ main.cpp: In function 'int main()': main.cpp:55:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.in","r",stdin); ^ main.cpp:56:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heapuri.out","w",stdout); ^