Submission #20985

#	Time	Username	Problem	Language	Result	Execution time	Memory
20985		ainta	Trapezi (COI17_trapezi)	C++14	100 / 100	39 ms	153908 KiB

trapezi

#include<cstdio>
int n, M, pv, cnt;
char p[22];
int w[13][22], D[2][1048576];
int Q[12][22][70100], Path[12][22][70100], tail[12][22];
void Ins(int x, int y, int a, int b, int num){
//    printf("%d %d\n",a,b);
    if(D[a][b])return;
    D[a][b] = 1;
    Q[x][y][++tail[x][y]] = b;
    Path[x][y][tail[x][y]] = num;
}
void Do1(int mask, int x, int y, int nxt, int num){
    if(y+2 < M && (mask >> (M-2)) == 7){
        Ins(x, y, !pv, ((mask ^ (7 << (M-2))) << 1) | nxt, num);
    }
    if(y+1 < M && (mask >> (M-1)) == 3 && mask & 1){
        Ins(x, y, !pv, ((mask ^ (3 << (M-1)) ^ 1) << 1) | nxt, num);
    }
    if(y+1 < M && (mask >> M) && (mask&1) && nxt){
        Ins(x, y, !pv, (mask ^ (1 << M) ^ 1) << 1, num);
    }
    if(y && (mask >> M) && (mask&3) == 3){
        Ins(x, y, !pv, ((mask ^ (1 << M) ^ 3) << 1) | nxt, num);
    }
}
void Do2(int mask, int x, int y, int nxt, int num){
    if(y+2 < M && (mask >> (M-2)) == 7){
        Ins(x, y, !pv, ((mask ^ (7 << (M-2))) << 1) | nxt, num);
    }
    if(y+1 < M && (mask >> (M-1)) == 3 && nxt){
        Ins(x, y, !pv, (mask ^ (3 << (M-1))) << 1, num);
    }
}
int E[60][60], Col[60];
void Make(int a, int b){
    if(a&&b&&a!=b)E[a][b]=E[b][a]=1;
}
bool v[7];
int main(){
    int i, b, e, j, k;
    scanf("%d",&n);
    M = 4*n-1;
    for(i=1;i<=n+n;i++){
        if(i<=n)b = n-i, e = 3*n+i-2;
        else b = i-n-1, e = 5*n-i-1;
        scanf("%s",p+b);
        for(j=b;j<=e;j++){
            if(p[j]=='0')w[i][j] = 1;
        }
    }
    int s = 0;
    for(i=0;i<M;i++) if(w[1][i]) s += 1 << (M-i);
    if(w[2][0])s++;
    Ins(0,M-1,0,s,0);
    int px = 0, py = M-1;
    for(i=1;i<=n+n;i++){
        for(j=0;j<M;j++){
            int nxt = w[i+1][j+1];
            if(j==M-1)nxt = w[i+2][0];
            for(k=1;k<=tail[px][py];k++){
                int t = Q[px][py][k];
                if(t >> M){
                    if((n+i+j+1)&1) Do1(Q[px][py][k], i, j, nxt, k);
                    else Do2(Q[px][py][k], i, j, nxt, k);
                }
                else Ins(i, j, !pv, (t<<1) | nxt, k);
            }
            for(k=1;k<=tail[px][py];k++){
                D[pv][Q[px][py][k]] = 0;
            }
            pv = !pv;
            px = i, py = j;
        }
    }
    if(!tail[n+n][M-1]){
        puts("nemoguce");
        return 0;
    }
    int x = 1;
    for(i=n+n;i>=1;i--){
        for(j=M-1;j>=0;j--){
            int t = Q[i][j][x], tt = Path[i][j][x], y;
            if(j)y = Q[i][j-1][tt];
            else y = Q[i-1][M-1][tt];
            if(y >> M){
                int dif = y ^ (t >> 1);
                if((dif >> (M-2)) == 7){
                    w[i][j]=w[i][j+1]=w[i][j+2]=++cnt;
                }
                else if((dif >> (M-1)) == 2){
                    if(dif & 2) w[i][j]=w[i+1][j]=w[i+1][j-1]=++cnt;
                    else w[i][j]=w[i+1][j]=w[i+1][j+1]=++cnt;
                }
                else if(dif & 1){
                    w[i][j]=w[i][j+1]=w[i+1][j]=++cnt;
                }
                else{
                    w[i][j]=w[i][j+1]=w[i+1][j+1]=++cnt;
                }
            }
            x = tt;
        }
    }
    for(i=1;i<=n+n;i++){
        for(j=0;j<M;j++){
            if(j)Make(w[i][j],w[i][j-1]);
            Make(w[i][j],w[i][j+1]);
            if((n+i+j+1)&1)Make(w[i][j],w[i+1][j]);
            else Make(w[i][j],w[i-1][j]);
        }
    }
    for(i=1;i<=cnt;i++){
        for(j=1;j<=6;j++)v[j]=false;
        for(j=1;j<=cnt;j++)if(E[i][j])v[Col[j]]=true;
        for(j=1;j<=6;j++)if(!v[j])break;
        Col[i]=j;
    }
    for(i=1;i<=n+n;i++){
        if(i<=n)b = n-i, e = 3*n+i-2;
        else b = i-n-1, e = 5*n-i-1;
        for(j=b;j<=e;j++){
            if(w[i][j])printf("%d",Col[w[i][j]]);
            else printf(".");
        }
        printf("\n");
    }
}

Compilation message (stderr)

trapezi.cpp: In function 'int main()':
trapezi.cpp:42:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
trapezi.cpp:47:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s",p+b);
                        ^

• Subtask 1: 6 / 6
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 22 / 22
• Subtask 5: 37 / 37