func_code_string: #include <bits/stdc++.h>   using namespace std;   struct line {     int x, l;   } c[105];   bool cmp(line a, line b) { return a.x < b.x; }   int f[105][105][2];   int main() {     int n;     scanf( %d , &n);     for (int i = 1; i <= n; i++) scanf( %d%d , &c[i].x, &c[i].l);     sort(c + 1, c + n + 1, cmp);     c[0].x = -1e9;     int ans = 0;     for (int i = 0; i <= n; i++)       for (int j = 0; j <= i; j++)         for (int p1 = 0; p1 <= 1; p1++) {           ans = max(ans, f[i][j][p1]);           int t = c[j].x + p1 * c[j].l, mx = -1e9, id = 0, y = 0;           for (int k = i + 1; k <= n; k++)             for (int p2 = 0; p2 <= 1; p2++) {               int o = c[k].x + p2 * c[k].l;               if (o > mx) mx = o, id = k, y = p2;               f[k][id][y] =                   max(f[k][id][y], f[i][j][p1] + min(o - t, c[k].l) + mx - o);             }         }     printf( %d , ans);     return 0;   }   