小編原以為自己可以拿到50分的好成績，結果只拿到了30分，小編當時很疑惑，考後看了很久也沒看出來錯在了哪裡，你看出來了嗎？

      } else {
		int last = 0, sum = 0;
		for (register int i = 1; i <= m; i++) {
			k[i] = read(), v[i] = read();
			if (k[i] == 1) {
				last = i;
				sum = 0;
			} else {
				sum += v[i];
			}
		}
		int C, K, V;
		for (register int i = 1; i <= q; i++) {
			C = read(), K = read(), V = read();
			if (C < last) {///在左無影響
				k[C] = K, v[C] = V;
				printf ("%d\n", sum);
			} else if (C == last && K == '1') {//不變
				printf ("%d\n", sum);
			} else if (C > last && K == '0') {//在右加答案
				sum += (V - v[C]);
				k[C] = 0, v[C] = V;
				printf ("%d\n", sum);
			} else if (C == last && K == '0') {//換切點
				k[C] = 0, v[C] = V;
				sum += V;
				for (register int j = last - 1; j >= 1; j--) {
					if (k[j] == '1') {
						last = j;
						break;
					} else {
						sum += v[j];
					}
				}
				printf ("%d\n", sum);
			} else if (C > last && K == '1') {//
				k[C] = 1, v[C] = V;
				for (register int j = m; j >= 1; j--) {
					if (k[j] == '1') {
						last = j;
						break;
					} else {
						sum += v[j];
					}
				}
				printf ("%d\n", sum);
			}
		}
	}
 

答案揭曉：

	} else {
		int last = 0, sum = 0;
		for (register int i = 1; i <= m; i++) {
			k[i] = read(), v[i] = read();
			if (k[i] == 1) {
				last = i;
				sum = 0;
			} else {
				sum += v[i];
			}
		}
		int C, K, V;
		for (register int i = 1; i <= q; i++) {
			C = read(), K = read(), V = read();
			if (C < last) {///在左無影響
				k[C] = K, v[C] = V;
				printf ("%d\n", sum);
			} else if (C == last && K == 1) {//不變
				printf ("%d\n", sum);
			} else if (C > last && K == 0) {//在右加答案
				sum += (V - v[C]);
				k[C] = 0, v[C] = V;
				printf ("%d\n", sum);
			} else if (C == last && K == 0) {//換切點
				k[C] = 0, v[C] = V;
				sum += V;
				for (register int j = last - 1; j >= 1; j--) {
					if (k[j] == 1) {
						last = j;
						break;
					} else {
						sum += v[j];
					}
				}
				printf ("%d\n", sum);
			} else if (C > last && K == 1) {//
				sum = 0;
				k[C] = 1, v[C] = V;
				for (register int j = m; j >= 1; j--) {
					if (k[j] == 1) {
						last = j;
						break;
					} else {
						sum += v[j];
					}
				}
				printf ("%d\n", sum);
			}
		}
	}
 

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