【UOJ #17】【NOIP 2014】飞扬的小鸟

http://uoj.ac/problem/17

dp,注意细节。

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int in() {
int k = 0, fh = 1; char c = getchar();
for(; c < '0' || c > '9'; c = getchar())
if (c == '-') fh = -1;
for(; c >= '0' && c <= '9'; c = getchar())
k = (k << 3) + (k << 1) + c - '0';
return k * fh;
} bool guan[10003];
int n, m, k, inf, up[10003], down[10003], X[10003], Y[10003], f[10003][1003]; void newit(int &a, int b, int delta) {
if (b != inf) {
if (a == inf) a = b + delta;
else a = min(a, b + delta);
}
} int main() {
n = in(); m = in(); k = in();
for(int i = 1; i <= n; ++i)
X[i] = in(), Y[i] = in();
for(int i = 1; i <= n; ++i) down[i] = 1, up[i] = m;
int pos;
for(int i = 1; i <= k; ++i) {
pos = in();
guan[pos] = true;
down[pos] = in();
up[pos] = in();
++down[pos];
--up[pos];
} memset(f, 127, sizeof(f)); inf = f[0][0];
for(int i = 1; i <= m; ++i)
f[0][i] = 0; int tmp = 0;
for(int i = 1; i <= n; ++i) {
for(int j = 1; j <= m; ++j)
if (j != m) {
if (j > X[i]) {
f[i][j] = min(f[i][j], f[i - 1][j - X[i]] + 1);
f[i][j] = min(f[i][j], f[i][j - X[i]] + 1);
}
} else {
for(int k = max(1, m - X[i]); k <= m; ++k) {
f[i][j] = min(f[i][j], f[i - 1][k] + 1);
f[i][j] = min(f[i][j], f[i][k] + 1);
}
} for(int j = down[i]; j <= up[i]; ++j) {
if (j + Y[i] <= m) f[i][j] = min(f[i][j], f[i - 1][j + Y[i]]);
if (f[i][j] < inf) tmp = i;
}
for(int j = 0; j < down[i]; ++j) f[i][j] = inf;
for(int j = up[i] + 1; j <= m; ++j) f[i][j] = inf;
if (tmp != i) break;
} int ans;
if (tmp == n) {
puts("1");
ans = inf;
for(int i = down[n]; i <= up[n]; ++i)
if (f[n][i] < ans) ans = f[n][i];
printf("%d\n", ans);
} else {
puts("0");
ans = 0;
for(int i = 0; i <= tmp; ++i)
if (guan[i]) ++ans;
printf("%d\n", ans);
}
return 0;
}

QwQ

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