Codeforces 855B Marvolo Gaunt's Ring
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/* Codeforces 855B Marvolo Gaunt‘s Ring SB dp 然后WA了三发才过 原因是极大值太小了 INF = 1e9 = WA INF = 1e18 = WA INF = 8e18 = AC */ #include <cstdio> #define INF 8e18 #define Max 123123 #define rg register typedef long long LL; LL f[Max], v[Max]; inline void cmax (LL &a, LL b) { if (b > a) a = b; } inline LL max (LL a, LL b) { return a > b ? a : b; } int main (int argc, char *argv[]) { LL N, p, q, r; scanf ("%lld%lld%lld%lld", &N, &p, &q, &r); rg int i, j; f[0] = -INF; LL s = -INF; for (i = 1; i <= N; ++ i) scanf ("%lld", &v[i]), f[i] = max (f[i - 1], p * v[i]); for (i = 1; i <= N; ++ i) f[i] = max (f[i - 1], f[i] + q * v[i]); for (i = 1; i <= N; ++ i) f[i] = max (f[i - 1], f[i] + r * v[i]), cmax (s, f[i]); printf ("%lld", s); return 0; }
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Codeforces 855B Marvolo Gaunt's Ring