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#include <stdio.h>
#include <stdlib.h>
#include "board.h"
#define LARGE 100000
static inline int min(int a, int b) {
return a < b ? a : b;
}
static inline int max(int a, int b) {
return a < b ? b : a;
}
static int win_score[4] = {
[WIN_NONE] = 0,
[WIN_P0] = 1000,
[WIN_P1] = -1000,
[WIN_DRAW] = 0,
};
static int evaluate(cboard_t B) {
(void)B;
return 0;
}
static int minimax_p0(cboard_t B, int alpha, int beta, int depth);
static int minimax_p1(cboard_t B, int alpha, int beta, int depth) {
if (depth == 0) return evaluate(B);
enum win_t win = b_win(B);
if (win != WIN_NONE) return win_score[win];
int best = LARGE;
for (int i = 0; i < 16; i++) {
if (b_stk_full(B, i)) continue;
board_t C; b_set(C, B);
b_drop(C, i, 1);
int sc = minimax_p0(C, alpha, beta, depth - 1);
best = min(sc, best);
beta = min(best, beta);
if (beta <= alpha) break;
}
return best;
}
static int minimax_p0(cboard_t B, int alpha, int beta, int depth) {
if (depth == 0) return evaluate(B);
enum win_t win = b_win(B);
if (win != WIN_NONE) return win_score[win];
if (depth >= 36) {
printf("depth=%d alpha=%d beta=%d\n", depth, alpha, beta);
}
int best = -LARGE;
for (int i = 0; i < 16; i++) {
if (b_stk_full(B, i)) continue;
board_t C; b_set(C, B);
b_drop(C, i, 0);
int sc = minimax_p1(C, alpha, beta, depth - 1);
best = max(sc, best);
alpha = max(best, alpha);
if (beta <= alpha) break;
}
return best;
}
int main(void) {
board_t B = {0, 0};
printf("%d\n", minimax_p0(B, -LARGE, LARGE, 64));
}
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