Submission #6496868

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pp;
typedef pair<ll,ll> pll;
void read(int& x){ scanf("%d",&x); }
void read(ll& x){ scanf("%lld",&x); }
void read(pp& x){ scanf("%d%d",&x.first, &x.second); }
void read(pll& x){ scanf("%lld%lld",&x.first, &x.second); }
template<typename T,typename... Args>
void read(T& a,Args&... b){ read(a); read(b...); }
void cppio(){ ios_base::sync_with_stdio(0); cin.tie(0); }
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define eb emplace_back
#define x first
#define y second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define sz(x) (int)(x).size()

const int maxn = 510;
int n;
int cost[maxn][maxn];

ll dp[maxn][maxn];

ll cp[maxn][maxn];
ll gp[maxn][maxn];

int main()
{
	cppio();
	cin >> n;
	rrep(i, n) rrep(j, n) if(i != j) cin >> cost[i][j];

	rrep(i, n) rrep(j, n)
		cp[i][j] = cp[i-1][j] + cp[i][j-1] - cp[i-1][j-1] + cost[i][j];

	rrep(i, n) {
		for(int j=i+1; j<=n; ++j) {
			gp[i][j] = gp[i][j-1];
			for(int k=i; k<j; ++k) {
				gp[i][j] += cost[k][j];
			}
		}
	}

	memset(dp, 0x7f, sizeof(dp));

	dp[1][1] = 0;
	for(int i=2; i<=n; ++i)
		dp[1][i] = gp[1][i];

	auto rect = [&](int l, int r, int d, int u) -> ll {
		if(l>r || d>u) return 0;
		return cp[r][u] - cp[l-1][u] - cp[r][d-1] + cp[l-1][d-1];
	};

	rrep(l, n) {
		for(int r=l; r<=n; ++r) {
			for(int R=r+1; R<=n; ++R) {
				dp[r+1][R] = min(dp[r+1][R],
					dp[l][r] + gp[r+1][R] +
						rect(r+1, R, 1, l-1));
			}
		}
	}

/*
	rrep(i, n) {
		for(int j=i; j<=n; ++j) printf("dp[%d][%d] = %lld\n", i, j, dp[i][j]);
	}
*/

	ll ans = 1ll << 60;
	rrep(i, n) ans = min(ans, dp[i][n]);

	cout << ans << endl;

	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void read(int&)’:
./Main.cpp:6:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 void read(int& x){ scanf("%d",&x); }
                                  ^
./Main.cpp: In function ‘void read(ll&)’:
./Main.cpp:7:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 void read(ll& x){ scanf("%lld",&x); }
                                   ^
./Main.cpp: In function ‘void read(pp&)’:
./Main.cpp:8:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 void read(pp& x){ scanf("%d%d",&x.first, &x.second); }
                                                    ^
./Main.cpp: In function ‘void read(pll&)’:
./Main.cpp:9:57: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 void read(pll& x){...

Judge Result