Eroare de compilare: user.cpp: In function ‘void solve(long long int, long long int, int, long long int)’: user.cpp:7:7: error: ‘a’ was not declared in this scope if (a <= st && dr <= b) { ^ user.cpp:7:24: error: ‘b’ was not declared in this scope if (a <= st && dr <= b) { ^ user.cpp:8:5: error: ‘ans’ was not declared in this scope ans = max(ans, sum[B] + nr); ^~~ user.cpp:8:20: error: ‘sum’ was not declared in this scope ans = max(ans, sum[B] + nr); ^~~ user.cpp:12:7: error: ‘a’ was not declared in this scope if (a <= mid) ^ user.cpp:14:7: error: ‘b’ was not declared in this scope if (b >= mid + 1ll) ^ user.cpp:15:33: error: ‘cost’ was not declared in this scope solve(mid + 1ll, dr, B - 1, cost[B] + nr); ^~~~