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| # pragma optimize("O3")
# pragma GCC optimize ("Ofast")
# pragma GCC optimize ("unroll-loops")
# pragma GCC target("sse,sse2,sse3,ssse3,sse4,avx,avx2")
#include <stdio.h>
#include <memory.h>
#define gc() getchar_unlocked()
int dp[16][16], N, M;
int fRI(){
register int N = gc(), r = 0;
for(;0x30>N||N>0x3A;N=gc());
do{
r = (r<<3) + (r<<1) + (N&0b1111); N = gc();
}while(0x30<=N);
return r;
}
int dfs(int cx, int cy, int tx, int ty){
if(dp[cy][cx]!=-1) return dp[cy][cx];
dp[cy][cx] = 0;
if(cy+1<=ty) dp[cy][cx] += dfs(cx,cy+1,tx,ty);
if(cx+1<=tx) dp[cy][cx] += dfs(cx+1,cy,tx,ty);
return dp[cy][cx];
}
int main(void){
register int N = fRI(), M = fRI(), K = fRI(),i, j,cnt=0;
memset(dp,-1,sizeof(dp));
dp[N][M] = 1;
if(K){
for(i = 1 ; i <= N; i++)
for(j = 1; j <= M; j++){
++cnt;
if(!(cnt^K)){
dfs(j,i,M,N);
printf("%d",dfs(1,1,j,i));
return 0;
}
}
}
else
printf("%d",dfs(1,1,M,N));
return 0;
}
|
