Compilare: main.cpp: In instantiation of 'void FenwickTree<T>::update(int, const T&) [with T = int]': main.cpp:127:18: required from here main.cpp:43:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int next = position; next < tree.size(); next = getNext(next)) { main.cpp: In instantiation of 'void FenwickTree<T>::__build() [with T = int]': main.cpp:24:10: required from 'FenwickTree<T>::FenwickTree(std::vector<T>&) [with T = int]' main.cpp:84:54: required from here main.cpp:55:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < tree.size(); ++i) { main.cpp: In instantiation of 'void FenwickTree<T>::__propagateToNext(int) [with T = int]': main.cpp:56:21: required from 'void FenwickTree<T>::__build() [with T = int]' main.cpp:24:10: required from 'FenwickTree<T>::FenwickTree(std::vector<T>&) [with T = int]' main.cpp:84:54: required from here main.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int next = i; next < tree.size(); next = getNext(next)) { main.cpp: In function 'void answer(SearchFenwickTree&, int, FILE*, FILE*)': main.cpp:122:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int type; fscanf(fin, "%d", &type); ^ main.cpp:126:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int a, b; fscanf(fin, "%d %d", &a, &b); ^ main.cpp:131:43: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int a, b; fscanf(fin, "%d %d", &a, &b); ^ main.cpp:136:35: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int eq; fscanf(fin, "%d", &eq); ^ main.cpp: In function 'void solve()': main.cpp:150:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &N, &M); ^ main.cpp:154:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int x; fscanf(fin, "%d", &x); ^