func_code_string: #include <bits/stdc++.h>   using namespace std;   template <class t>   inline void rd(t &s) {     s = 0;     register char c = getchar();     while (!isdigit(c)) c = getchar();     while (isdigit(c)) s = (s << 3) + (s << 1) + (c ^ 48), c = getchar();     return;   }   int ans[5050];   signed main(void) {     register int n, x1, x2, x3, x;     scanf( %d , &n);     printf( ? 1 2 n );     fflush(stdout);     scanf( %d , &x1);     printf( ? 2 3 n );     fflush(stdout);     scanf( %d , &x2);     printf( ? 1 3 n );     fflush(stdout);     scanf( %d , &x3);     ans[2] = (x1 + x2 - x3) / 2;     ans[1] = x1 - ans[2];     ans[3] = x2 - ans[2];     for (int i = 4; i <= n; ++i) {       printf( ? %d %d n , i - 1, i);       fflush(stdout);       scanf( %d , &x);       ans[i] = x - ans[i - 1];     }     printf( !  );     for (int i = 1; i <= n; ++i) printf( %d  , ans[i]);     printf(  n );     fflush(stdout);     return 0;   }   