제출 #168281

#제출 시각아이디문제언어결과실행 시간메모리
168281arnold518섬 항해 (CEOI13_adriatic)C++14
100 / 100
384 ms200568 KiB
#pragma GCC optimize("O3") #pragma GCC optimize("Ofast") #pragma GCC optimize("unroll-loops") #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> pii; typedef pair<ll, ll> pll; const int MAXN = 25e4; const int M = 2500; struct Point { int x, y; }; int N, B[M+10][M+10]; Point A[MAXN+10]; int cnt[M+10][M+10]; int p1[M+10][M+10], q1[M+10][M+10]; int p2[M+10][M+10], q2[M+10][M+10]; int dp1[M+10][M+10], dp2[M+10][M+10]; int numpoint(int yy1, int yy2, int x1, int x2) { if(x1>x2) swap(x1, x2); if(yy1>yy2) swap(yy1, yy2); return cnt[yy2][x2]-cnt[yy1-1][x2]-cnt[yy2][x1-1]+cnt[yy1-1][x1-1]; } int xx1(int i, int j) { return min(p2[i][1], p2[M][j]); } int yy1(int i, int j) { return max(q2[i][1], q2[M][j]); } int xx2(int i, int j) { return max(p1[i][M], p1[1][j]); } int yy2(int i, int j) { return min(q1[i][M], q1[1][j]); } int main() { int i, j; scanf("%d", &N); for(i=1; i<=N; i++) scanf("%d%d", &A[i].y, &A[i].x), B[A[i].y][A[i].x]++; for(i=1; i<=M; i++) for(j=1; j<=M; j++) cnt[i][j]=cnt[i-1][j]+cnt[i][j-1]-cnt[i-1][j-1]+B[i][j]; for(i=1; i<=M; i++) { q1[M+1][i]=M+1; q1[i][0]=M+1; } q1[M+1][0]=M+1; for(i=M; i>=0; i--) for(j=1; j<=M+1; j++) { p1[i][j]=max(p1[i+1][j], p1[i][j-1]); if(B[i][j]) p1[i][j]=j; q1[i][j]=min(q1[i+1][j], q1[i][j-1]); if(B[i][j]) q1[i][j]=i; } for(i=1; i<=M; i++) { p2[0][i]=M+1; p2[i][M+1]=M+1; } p2[0][M+1]=M+1; for(i=1; i<=M+1; i++) for(j=M; j>=0; j--) { p2[i][j]=min(p2[i-1][j], p2[i][j+1]); if(B[i][j]) p2[i][j]=j; q2[i][j]=max(q2[i-1][j], q2[i][j+1]); if(B[i][j]) q2[i][j]=i; } for(i=M; i>=1; i--) for(j=1; j<=M; j++) { dp1[i][j]=dp1[max(i, yy1(i-1, j+1))][min(j, xx1(i-1, j+1))]+numpoint(i, M, 1, j); } for(i=1; i<=M; i++) for(j=M; j>=1; j--) { dp2[i][j]=dp2[min(i, yy2(i+1, j-1))][max(j, xx2(i+1, j-1))]+numpoint(1, i, j, M); } for(i=1; i<=N; i++) printf("%d\n", N+dp1[A[i].y][A[i].x]+dp2[A[i].y][A[i].x]-3); /* printf("================\n"); for(i=1; i<=M; i++) { for(j=1; j<=M; j++) printf("%d ", dp1[i][j]); printf("\n"); }; printf("================\n"); for(i=1; i<=M; i++) { for(j=1; j<=M; j++) printf("%d ", dp2[i][j]); printf("\n"); }; */ }

컴파일 시 표준 에러 (stderr) 메시지

adriatic.cpp: In function 'int main()':
adriatic.cpp:40:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
     ~~~~~^~~~~~~~~~
adriatic.cpp:41:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=1; i<=N; i++) scanf("%d%d", &A[i].y, &A[i].x), B[A[i].y][A[i].x]++;
                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
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