二维前缀和的正确姿势

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inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}
inline int get_sum(int x1, int y1, int x2, int y2) {
  return sum[x2][y2] + sum[x1 - 1][y1 - 1] - sum[x2][y1 - 1] - sum[x1 - 1][y2];
}