Compilare: main.cpp: In function 'void solve(int, int)': main.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < currentNode.queries.size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < currentNode.descendants.size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.in", "r", stdin); ^ main.cpp:73:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.out", "w", stdout); ^