제출 #151245

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
151245		Ruxandra985	Strah (COCI18_strah)	C++14	110 / 110	203 ms	98612 KiB

strah

#include <cstdio>

using namespace std;
int a[2010][2010],jos[2010][2010],st[2010];
long long s[2010][2010] , dp[2010][2010];
int main()
{
    FILE *fin = stdin;
    FILE *fout = stdout;
    int n,m,i,j,len,elem;
    char c;
    long long sol=0;
    fscanf (fin,"%d%d",&n,&m);
    for (i=1;i<=n;i++){
        fgetc (fin);
        for (j=1;j<=m;j++){
            c=fgetc (fin);
            if (c=='#')
                a[i][j] = 1; /// blocat
        }
    }
    /// precalculare jos
    for (i=n;i;i--){
        for (j=1;j<=m;j++){
            if (a[i][j] == 0) /// cate sunt in jos
                jos[i][j] = jos[i+1][j] + 1;
            else jos[i][j] = 0;
        }
    }
    /// fixezi o linie
    sol = 0;
    for (i=1;i<=n;i++){
        elem = 0;
        st[0] = 0;
        for (j=1;j<=m;j++){
            while (elem && jos[i][st[elem]] >= jos[i][j]){
                elem--;
            }
            st[++elem] = j;
            /// st[elem-1] = primul mai mic
            /// j are influenta in intervalul st[elem-1] + 1 .. st[elem]
            len = st[elem] - st[elem-1];



            s[i][j] = (long long)(jos[i][j] * (jos[i][j] + 1) / 2) * (len * (len+1) / 2);
            s[i][j] += len * dp[i][st[elem-1]] + s[i][st[elem-1]];

            sol+=s[i][j];

            /// dp[i][j] = suma h urilor folosite de la j in stanga
            /// s[i][j] = simplu
            dp[i][j] = (long long)(jos[i][j] * (jos[i][j] + 1) / 2) * len + dp[i][st[elem-1]];
        }

        //printf ("%lld\n",sol);
    }
    fprintf (fout,"%lld",sol);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

strah.cpp: In function 'int main()':
strah.cpp:13:12: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     fscanf (fin,"%d%d",&n,&m);
     ~~~~~~~^~~~~~~~~~~~~~~~~~

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