Submission #135166

#	Time	Username	Problem	Language	Result	Execution time	Memory
135166		duality	Dango Maker (JOI18_dango_maker)	C++11	100 / 100	719 ms	18168 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
#define mp make_pair
#define pb push_back
typedef long long int LLI;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;

char grid[3000][3000];
int main() {
    int i,j;
    int N,M;
    scanf("%d %d",&N,&M);
    for (i = 0; i < N; i++) {
        for (j = 0; j < M; j++) scanf(" %c",&grid[i][j]);
    }

    int ans = 0;
    for (i = 0; i < N+M-1; i++) {
        vi h,v;
        for (j = 0; j < N; j++) {
            int x = i-j,y = j;
            if ((x >= 0) && (x+2 < M) && (grid[y][x] == 'R') && (grid[y][x+1] == 'G') && (grid[y][x+2] == 'W')) h.pb(j);
            if ((x >= 0) && (x < M) && (y+2 < N) && (grid[y][x] == 'R') && (grid[y+1][x] == 'G') && (grid[y+2][x] == 'W')) v.pb(j);
        }
        ans += h.size()+v.size();
        int k = 0;
        for (j = 0; j < h.size(); j++) {
            while ((k < v.size()) && (v[k] < h[j]-2)) k++;
            if ((k < v.size()) && (v[k] <= h[j])) k++,ans--;
        }
    }
    printf("%d\n",ans);

    return 0;
}

Compilation message (stderr)

dango_maker.cpp: In function 'int main()':
dango_maker.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (j = 0; j < h.size(); j++) {
                     ~~^~~~~~~~~~
dango_maker.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             while ((k < v.size()) && (v[k] < h[j]-2)) k++;
                     ~~^~~~~~~~~~
dango_maker.cpp:31:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if ((k < v.size()) && (v[k] <= h[j])) k++,ans--;
                  ~~^~~~~~~~~~
dango_maker.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&N,&M);
     ~~~~~^~~~~~~~~~~~~~~
dango_maker.cpp:16:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         for (j = 0; j < M; j++) scanf(" %c",&grid[i][j]);
                                 ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 20 / 20
• Subtask 3: 67 / 67