Program11

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Code given below is intended to find no. of solutions to the equation : a + b + c ≤ N, such that 0 ≤ a ≤ A, 0 ≤ b ≤ B, 0 ≤ c ≤ C. 0 ≤ N,A,B,C ≤ 2500 long long int f(long long int n) { long long int r; r = (n+1)(n+2)(n+3); return (r/6) ; } main() { long long int N,A,B,C; scanf("%lld%lld%lld%lld",N,A,B,C); printf("%lld\n",f(N)-f(N-A-1)-f(N-B-1)-f(N-C-1)+f(N-A-B-2)+f(N-A-C-2)+f(N-C-B-2

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solution.cppC++17

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