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public class FlipGameII {

public boolean canWin(String s) {

for (int i = 0; i < s.length(); ) {

int index = s.indexOf("++", i);

if (index >= i) {

String t = s.substring(0, index) + "--" + s.substring(index + 2);

if (!canWin(t)) {

return true;

}

i = index + 1;

} else {

break;

}

}

return false;

}

}