标签:logs for ack inf lis unsigned 分析 eof game
题意:求由R和F组成的矩阵中,最大的由F组成的矩阵面积。
分析:
1、hdu1506http://www.cnblogs.com/tyty-Somnuspoppy/p/7341431.html与此题相似。
2、将矩阵的每行看成1506中的坐标轴分别处理。
3、算出以该行为坐标轴,坐标轴上,每个由F组成的矩形的高度,与1506的区别是,1506中每个矩形高度已知。
4、按照1506的方法分别算出每个矩形最左边和最右边连续比其高的矩形的下标,通过(r[i][j] - l[i][j] + 1) * h[i][j]比较即可。
5、h[i][j]就相当于1506中a[i]。
h[i][j]----以第i行为坐标轴,第j个矩形的高度。
a[i]-----在坐标轴上,第i个矩形的高度。
#include<cstdio> #include<cstring> #include<cstdlib> #include<cctype> #include<cmath> #include<iostream> #include<sstream> #include<iterator> #include<algorithm> #include<string> #include<vector> #include<set> #include<map> #include<stack> #include<deque> #include<queue> #include<list> #define lowbit(x) (x & (-x)) const double eps = 1e-8; inline int dcmp(double a, double b){ if(fabs(a - b) < eps) return 0; return a > b ? 1 : -1; } typedef long long LL; typedef unsigned long long ULL; const int INT_INF = 0x3f3f3f3f; const int INT_M_INF = 0x7f7f7f7f; const LL LL_INF = 0x3f3f3f3f3f3f3f3f; const LL LL_M_INF = 0x7f7f7f7f7f7f7f7f; const int dr[] = {0, 0, -1, 1, -1, -1, 1, 1}; const int dc[] = {-1, 1, 0, 0, -1, 1, -1, 1}; const int MOD = 1e9 + 7; const double pi = acos(-1.0); const int MAXN = 1000 + 10; const int MAXT = 10000 + 10; using namespace std; int h[MAXN][MAXN], l[MAXN][MAXN], r[MAXN][MAXN]; int main(){ int K; scanf("%d", &K); while(K--){ memset(h, 0, sizeof h); memset(l, 0, sizeof l); memset(r, 0, sizeof r); int m, n; char c[5]; scanf("%d%d", &m, &n); for(int i = 1; i <= m; ++i){ for(int j = 1; j <= n; ++j){ scanf("%s", c); if(c[0] == ‘F‘) h[i][j] = h[i - 1][j] + 1; else h[i][j] = 0; } } int ans = 0; for(int i = 1; i <= m; ++i){ l[i][1] = 1; for(int j = 2; j <= n; ++j){ int tmp = j; while(tmp > 1 && h[i][tmp - 1] >= h[i][j]) tmp = l[i][tmp - 1]; l[i][j] = tmp; } r[i][n] = n; for(int j = n - 1; j >= 1; --j){ int tmp = j; while(tmp < n && h[i][tmp + 1] >= h[i][j]) tmp = r[i][tmp + 1]; r[i][j] = tmp; } for(int j = 1; j <= n; ++j){ ans = max(ans, (r[i][j] - l[i][j] + 1) * h[i][j]); } } printf("%d\n", ans * 3); } return 0; }
标签:logs for ack inf lis unsigned 分析 eof game
原文地址:http://www.cnblogs.com/tyty-Somnuspoppy/p/7341750.html