Submission #731820

#	Time	Username	Problem	Language	Result	Execution time	Memory
731820		maeola	Modsum (NOI12_modsum)	C++17	25 / 25	1 ms	304 KiB

modsum

// trans rights
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int N;
int X[6], Y[6];

int main(int argc, const char *argv[])
{
	scanf(" %d", &N);
	X[0] = 1;
	for (int k = 0; k < N; k++)
	{
		int u, v;
		scanf(" %d %d", &u, &v);
		memset(Y, 0, sizeof(Y));
		for (int r = u; r <= v; r++)
		{
			for (int i = 0; i < 5; i++)
				Y[(i + r) % 5] += X[i];
		}
		memcpy(X, Y, sizeof(X));
	}
	int ans = 0;
	for (int i = 0; i < 5; i++)
	{
		ans += X[i];
		ans += ((i * i * i * i + 2 * i * i) % 5) * X[i];
	}
	printf("%d", ans);
	return 0;
}

Compilation message (stderr)

modsum.cpp: In function 'int main(int, const char**)':
modsum.cpp:11:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |  scanf(" %d", &N);
      |  ~~~~~^~~~~~~~~~~
modsum.cpp:16:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   scanf(" %d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5