Compilare: user.cpp: In function ‘int main()’: user.cpp:31:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r - l + 1 > zero.size()) { ~~~~~~~~~~^~~~~~~~~~~~~ user.cpp:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dr == zero.size() || (st != -1 && l - zero[st] <= zero[dr] - r)) { ~~~^~~~~~~~~~~~~~ user.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st == -1 || (dr < zero.size() && l - zero[st] > zero[dr] - r)) ~~~^~~~~~~~~~~~~ user.cpp:19:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("copii3.in", "r", stdin); ^ user.cpp:20:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("copii3.out", "w", stdout); ^ user.cpp:21:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n%s", &n, &q, s + 1); ^ user.cpp:30:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &l, &r); ^