Compilare: main.cpp: In function 'void precompute_rmq()': main.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int32_t i = 0; i < eulerTour.size(); i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int32_t i = 1; i <= eulerTour.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:89:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int32_t j = 0; j < eulerTour.size(); j++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:91:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j + (1 << (i - 1)) < eulerTour.size()) { ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:188:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("traffickers.in", "r", stdin); ^ main.cpp:189:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("traffickers.out", "w", stdout); ^