UVa 10285 Longest Run on a Snowboard [DP]
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题意:给定一个整数矩阵,找到一条严格递减的最长路。
简单的动规题目,dp[i][j]表示走到(i, j)所走过的最长步数,向四个方向转移状态即可。
#include <bits/stdc++.h>using namespace std;const int maxn = 105;string str; int r, c;int a[maxn][maxn], dp[maxn][maxn];const int dir[4][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};inline bool in(const int x, const int y){ return x >= 0 && x < r && y >= 0 && y < c;}int solve(int x, int y){ if(dp[x][y] != -1) return dp[x][y]; int & ans = dp[x][y]; ans = 1; for(int i = 0; i < 4; ++i){ int xx = x + dir[i][0], yy = y + dir[i][1]; if(in(xx, yy) && a[xx][yy] > a[x][y]) ans = max(ans, solve(xx, yy) + 1); } return ans;}int main(){ int T; cin >> T; while(T--){ memset(dp, -1, sizeof(dp)); cin >> str >> r >> c; for(int i = 0; i < r; ++i) for(int j = 0; j < c; ++j) cin >> a[i][j]; int ans = INT_MIN; for(int i = 0; i < r; ++i) for(int j = 0; j < c; ++j) ans = max(ans, solve(i, j)); printf("%s: %d\n", str.c_str(), ans); } return 0;}
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