Submission #25547

#	Time	Username	Problem	Language	Result	Execution time	Memory
25547		youngyojun	스트랩 (JOI14_straps)	C++11	100 / 100	39 ms	21672 KiB

straps

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <set>
#include <map>
#include <unordered_map>
#include <bitset>
#include <string>
#define pb push_back
#define sz(V) ((int)(V).size())
#define allv(V) ((V).begin()),((V).end())
#define befv(V) ((V)[(sz(V)-2)])
#define sorv(V) sort(allv(V))
#define revv(V) reverse(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define clv(V) (V).clear()
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define rb(x) ((x)&(-(x)))
#define INF (1100000099)
#define INFLL (1100000000000000099ll)
#define MOD (1000000007)
#define MAXN (2005)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;

int d[MAXN][MAXN];
bool chk[MAXN][MAXN];
int A[MAXN], B[MAXN], P[MAXN];
int N, Ans;

int main() {
	for(int i = 0; i < MAXN; i++) fill(d[i], d[i]+MAXN, -INF);
	scanf("%d", &N);
	for(int i = 1; i <= N; i++) scanf("%d%d", &A[i], &B[i]);
	for(int i = 1; i <= N; i++) A[i]--;
	for(int i = 1; i <= N; i++) P[i] = i;
	sort(P+1, P+N+1, [&](const int& a, const int& b) -> bool { return A[a] > A[b]; });
	d[0][1] = 0; chk[0][1] = true;
	for(int i = 1; i <= N; i++) {
		for(int j = 1; j <= N; j++) {
			if(!chk[i-1][j]) continue;
			upmax(d[i][min(N, j+A[P[i]])], d[i-1][j] + B[P[i]]);
			chk[i][min(N, j+A[P[i]])] = true;
		}
		for(int j = 0; j <= N; j++) {
			if(!chk[i-1][j]) continue;
			chk[i][j] = true; upmax(d[i][j], d[i-1][j]);
		}
	}
	for(int i = 0; i <= N; i++) upmax(Ans, d[N][i]);
	printf("%d\n", Ans);
	return 0;
}

Compilation message (stderr)

straps.cpp: In function 'int main()':
straps.cpp:46:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
                 ^
straps.cpp:47:57: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i = 1; i <= N; i++) scanf("%d%d", &A[i], &B[i]);
                                                         ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 45 / 45
• Subtask 4: 45 / 45