제출 #97772

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
97772		alexpetrescu	새로운 문제 (COCI19_akvizna)	C++14	65 / 130	1576 ms	69852 KiB

Main

#include <cstdio>
#include <algorithm>

//FILE *fin = fopen("a.in", "r"), *fout = fopen("a.out", "w");
#define fin stdin
#define fout stdout

#define MAXN 3000

double dp[MAXN + 1][MAXN + 1], d[MAXN + 1][MAXN + 1];
double a[MAXN + 1], b[MAXN + 1];
int dq[MAXN + 1], u, st, dr;

inline double intersect(int p, int q) {
    return (b[q] - b[p]) / (a[p] - a[q]);
}

inline void baga(double X, double Y) {
    u++;
    a[u] = X;
    b[u] = Y;
    while (st < dr && (b[dq[dr - 1]] <= b[u] || (st < dr - 1 && intersect(dq[dr - 2], dq[dr - 1]) > intersect(dq[dr - 2], u))))
        dr--;
    dq[dr++] = u;
}

inline void scoate(int p) {
    while (st < dr - 1 && a[dq[st]] * p + b[dq[st]] < a[dq[st + 1]] * p + b[dq[st + 1]])
        st++;
}

int main() {
    int n, t;
    fscanf(fin, "%d%d", &n, &t);

    for (int i = 1; i <= t; i++) {
        st = dr = u = 0;
        for (int j = 1; j <= n; j++) {
            baga(1.0 / (n - j + 1), dp[i - 1][j - 1] - (j - 1.0) / (n - j + 1));
            scoate(j);
            dp[i][j] = a[dq[st]] * j + b[dq[st]];
        }
    }

    fprintf(fout, "%.15f\n", dp[t][n]);

    fclose(fin);
    fclose(fout);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

akvizna.cpp: In function 'int main()':
akvizna.cpp:34:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf(fin, "%d%d", &n, &t);
     ~~~~~~^~~~~~~~~~~~~~~~~~~~~

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