【HDOJ】2795 Billboard
线段树。注意h范围(小于等于n)。
1 #include <stdio.h> 2 #include <string.h> 3 4 #define MAXN 200005 5 #define lson l, mid, rt<<1 6 #define rson mid+1, r, rt<<1|1 7 #define mymax(x, y) (x>y) ? x:y 8 9 int nums[MAXN<<2]; 10 int h, w; 11 12 void PushUP(int rt) { 13 nums[rt] = mymax(nums[rt<<1], nums[rt<<1|1]); 14 } 15 16 void build(int l, int r, int rt) { 17 int mid; 18 nums[rt] = w; 19 20 if (l == r) 21 return ; 22 23 mid = (l+r)>>1; 24 build(lson); 25 build(rson); 26 } 27 28 int query(int wi, int l, int r, int rt) { 29 int mid, ret; 30 31 if (l == r) { 32 nums[rt] -= wi; 33 return l; 34 } 35 mid = (l+r)>>1; 36 37 if (nums[rt<<1] >= wi) 38 ret = query(wi, lson); 39 else 40 ret = query(wi, rson); 41 42 PushUP(rt); 43 return ret; 44 } 45 46 int main() { 47 int n, wi; 48 49 while (scanf("%d%d%d", &h, &w, &n) != EOF) { 50 if (h > n) 51 h = n; // h < n 52 build(1, h, 1); 53 while (n--) { 54 scanf("%d", &wi); 55 if (nums[1] < wi) 56 printf("-1\n"); 57 else 58 printf("%d\n", query(wi, 1, h, 1)); 59 } 60 } 61 62 return 0; 63 }