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int exgcd(int a,int b,int x[],int y[]) {
if(b == 0) {
x[0] = 1;
y[0] = 0;
return a;
}
else {
int r = exgcd(b, a % b, x, y);
int t = x[0];
x[0] = y[0];
y[0] = (t - a / b * y[0]);
return r;
}
}
int main() {
int a = 7, b = 15, x[1] = {1}, y[1] = {1};
exgcd(a, b, x, y);
x[0] = (x[0] % b + b) % b;
putint(x[0]);
return 0;
}
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