Compilare: user.cpp: In function ‘int binarySearch(std::vector<int>&, int)’: user.cpp:29:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(best + (1<<step) < v.size() && v[best + (1<<step)] <= value) best += (1<<step); ~~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:61:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(dq.size() > u || (dq.size() > l && dq.front() < 0)) { ~~~~~~~~~~^~~ user.cpp:61:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(dq.size() > u || (dq.size() > l && dq.front() < 0)) { ~~~~~~~~~~^~~ user.cpp:65:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dq.size() >= l) { ~~~~~~~~~~^~~~ user.cpp:49:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum2.in", "r", stdin); ^ user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sum2.out", "w", stdout); ^ user.cpp:52:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &l, &u); ^ user.cpp:58:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^