Compilare: user.cpp: In function ‘int cautbin(int)’: user.cpp:20:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(index <= n) ^ user.cpp:22:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[index] <= value) ^ user.cpp: In function ‘void solve()’: user.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i< len; ++i) ^ user.cpp:37:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = len; i<= sze; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:58:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j<= len; ++j) ^ user.cpp:50:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.in", "r", stdin); ^ user.cpp:51:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.out", "w", stdout); ^ user.cpp:52:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", buff+1); ^