結果
問題 | No.776 A Simple RMQ Problem |
ユーザー |
|
提出日時 | 2018-12-23 00:32:12 |
言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
結果 |
AC
|
実行時間 | 143 ms / 3,000 ms |
コード長 | 2,148 bytes |
コンパイル時間 | 205 ms |
コンパイル使用メモリ | 24,832 KB |
実行使用メモリ | 7,808 KB |
最終ジャッジ日時 | 2024-09-25 10:20:54 |
合計ジャッジ時間 | 4,506 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 26 |
コンパイルメッセージ
main.cpp: In function ‘int main()’: main.cpp:64:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 64 | scanf("%d %d", &n, &q); | ~~~~~^~~~~~~~~~~~~~~~~ main.cpp:67:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 67 | scanf("%d", &a); | ~~~~~^~~~~~~~~~ main.cpp:72:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 72 | scanf("%s", s); | ~~~~~^~~~~~~~~ main.cpp:75:18: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 75 | scanf("%d %d %d %d", &a, &b, &c, &d); | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:91:18: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 91 | scanf("%d %d", &k, &v); | ~~~~~^~~~~~~~~~~~~~~~~
ソースコード
#include <stdio.h>#define N 131072long long min(long long x, long long y) {return x < y ? x : y;}long long max(long long x, long long y) {return x > y ? x : y;}struct F {long long ans;long long sum;long long rmax;long long lmax;} dat[N * 2];struct F merge(F a, F b) {struct F res;res.sum = a.sum + b.sum;res.lmax = max(a.lmax, a.sum + b.lmax);res.rmax = max(b.rmax, b.sum + a.rmax);res.ans = max(max(a.ans, b.ans), a.rmax + b.lmax);return res;}void update(int k, int v) {k += N;dat[k].sum = v;dat[k].lmax = v;dat[k].rmax = v;dat[k].ans = v;while (k > 1) {k >>= 1;dat[k] = merge(dat[k * 2], dat[k * 2 + 1]);}}struct F query(int l, int r) {l += N;r += N;struct F ansl, ansr;ansl.sum = 0;ansl.lmax = -2e18;ansl.rmax = -2e18;ansl.ans = -2e18;ansr.sum = 0;ansr.lmax = -2e18;ansr.rmax = -2e18;ansr.ans = -2e18;while (l < r) {if (l & 1) ansl = merge(ansl, dat[l++]);if (r & 1) ansr = merge(dat[--r], ansr);l >>= 1;r >>= 1;}return merge(ansl, ansr);}int main(void) {int n, q;scanf("%d %d", &n, &q);for (int i = 0; i < n; i++) {int a;scanf("%d", &a);update(i, a);}while (q--) {char s[4];scanf("%s", s);if (s[0] == 'm') {int a, b, c, d;scanf("%d %d %d %d", &a, &b, &c, &d);a--;c--;int l = max(a, c);int r = min(b, d);long long ans = -2e18;if (l < r) {ans = max(ans, query(a, l).rmax + query(l, d).lmax);ans = max(ans, query(a, r).rmax + query(r, d).lmax);ans = max(ans, query(l, r).ans);} else {ans = max(ans, query(a, b).rmax + query(c, d).lmax + query(b, c).sum);}printf("%lld\n", ans);} else {int k, v;scanf("%d %d", &k, &v);update(k - 1, v);}}return 0;}