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UVaLive 6854 City (暴力)

题意:给定一个 n*m 的矩阵,表示有多少条道路与它相连,其中有一个-1,表示未知,道路只能横着和竖着,求-1处的值。

析:根据题意可知,一个点,与其他周围的四个点都可能相连的,也就是说肯定有共用道路的,所以,我们只要算四个点的数就好,然后依次推一下,就得到答案,

也就是说这里面的点可以分为两部分,一部分加起来减去另一部分,就是答案。

代码如下:

#pragma comment(linker, "/STACK:1024000000,1024000000")#include <cstdio>#include <string>#include <cstdlib>#include <cmath>#include <iostream>#include <cstring>#include <set>#include <queue>#include <algorithm>#include <vector>#include <map>#include <cctype>#include <cmath>#include <stack>#define freopenr freopen("in.txt", "r", stdin)#define freopenw freopen("out.txt", "w", stdout)using namespace std;typedef long long LL;typedef pair<int, int> P;const int INF = 0x3f3f3f3f;const double inf = 0x3f3f3f3f3f3f;const LL LNF = 0x3f3f3f3f3f3f;const double PI = acos(-1.0);const double eps = 1e-8;const int maxn = 500 + 5;const int mod = 1e9 + 7;const int dr[] = {-1, 0, 1, 0};const int dc[] = {0, 1, 0, -1};const char *Hex[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"};int n, m;const int mon[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};const int monn[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};inline int Min(int a, int b){ return a < b ? a : b; }inline int Max(int a, int b){ return a > b ? a : b; }inline LL Min(LL a, LL b){ return a < b ? a : b; }inline LL Max(LL a, LL b){ return a > b ? a : b; }inline bool is_in(int r, int c){    return r >= 0 && r < n && c >= 0 && c < m;}int main(){    int T;  cin >> T;    while(T--){        scanf("%d %d", &n, &m);        int ans = 0, val;        for(int i = 0; i < n; ++i)            for(int j = 0; j < m; ++j){                scanf("%d", &val);                if(val <= 0)  continue;                if(i+j & 1)  ans += val;                else ans -= val;            }        printf("%d\n", abs(ans));    }    return 0;}

  

UVaLive 6854 City (暴力)