SGU167

恶心的DP啊
题解网上很多，就不说了。

#include <cstdio>#include <cstring>#include <algorithm>#define REP(i, a, b) for(int i = (a); i <= (b); ++i)#define sum(i, l, r) (g[i][r] - g[i][l-1])#define code(l, r, opl, opr) ((l << 12) + (r << 8) + (opl << 4) + (opr))#define encode(s) (s >> 12) & 15, (s >> 8) & 15, (s >> 4) & 15, s & 15using namespace std;inline int read(){    int x = 0, f = 1, t = getchar();    while(t < 48 || t > 57) t == 45 ? f = -1 : 0, t = getchar();    while(t > 47 && t < 58) x = (x << 1) + (x << 3) + t - 48, t = getchar();    return x * f;}typedef int Array[16][16][16][2][2][226];int n, m, k, ans, arow, al, ar, aopl, aopr, g[16][16];Array f, p;//op = 0 / left//op = 1 \ rightvoid expand(int row, int l, int r, int opl, int opr, int s){    REP(ll, opl == 0 ? 1 : l, r) REP(rr, max(l, ll), opr == 1 ? m : r)    {        int opll = (ll == l ? opl : (ll < l ? 0 : 1));        int oprr = (rr == r ? opr : (rr < r ? 0 : 1));        int &res = f[row + 1][ll][rr][opll][oprr][s+(rr-ll+1)];        int tmp = f[row][l][r][opl][opr][s] + sum(row+1, ll, rr);        if(res < tmp) res = tmp, p[row + 1][ll][rr][opll][oprr][s+(rr-ll+1)] = code(l, r, opl, opr);    }}void write(int row, int l, int r, int opl, int opr, int s){    if(row == 0 || s <= 0) return ;    int pp = p[row][l][r][opl][opr][s];    write(row-1, encode(pp), s-(r-l+1));    REP(i, l, r) printf("%d %d\n", row, i);}int main(){    #ifndef ONLINE_JUDGE    freopen("input.txt", "r", stdin);    freopen("output.txt", "w", stdout);    #endif    n = read(), m = read(), k = read();    REP(i, 1, n) REP(j, 1, m) g[i][j] = g[i][j-1] + read();    memset(f, -1, sizeof(f));    REP(row, 1, n) REP(l, 1, m) REP(r, l, m) REP(opl, 0, 1) REP(opr, 0, 1)    {        f[row][l][r][opl][opr][r-l+1] = sum(row, l, r);        REP(s, r-l+1, k)        {            int &res = f[row][l][r][opl][opr][s];            if(res > 0)            {                if(row < n) expand(row, l, r, opl, opr, s);                if(s == k && res > ans) ans = res, arow = row, al = l, ar = r, aopl = opl, aopr = opr;            }        }    }    printf("Oil : %d\n", ans);    write(arow, al, ar, aopl, aopr, k);    #ifndef ONLINE_JUDGE    fclose(stdin), fclose(stdout);    #endif    return 0;}