Submission #38740

#	Time	Username	Problem	Language	Result	Execution time	Memory
38740		bakurits	Boat (APIO16_boat)	C++14	0 / 100	0 ms	2408 KiB

boat

#include <iostream>
#include <stdio.h>

const int N = 510;
const int BIG_N = 1e5;
const int rem = 1e9 + 7;

using namespace std;

int n;
int A[N], B[N];

int dp[BIG_N];

void print() {
    for (int i = 1; i < BIG_N; i++) {
        printf("%d ", dp[i]);
    }
    puts("");
}

int main() {
    scanf ("%d", &n);
    for (int i = 1; i <= n; i++) {
        scanf("%d %d", &A[i], &B[i]);
    }
    dp[0] = 1;

    for (int i = 1; i <= n; i++) {
        int sum = 0;
        for (int j = 0; j < A[i]; j++) {
            sum = (sum + dp[j]) % rem;
        }

        for (int j = A[i]; j <= B[i]; j++) {
            int sm = dp[j];
            dp[j] = (dp[j] + sum) % rem;
            sum = (sum + sm) % rem;
        }
     //   print();
    }


    int ans = 0;
    for (int i = 1; i < BIG_N; i++) {
        ans = (ans + dp[i]) % rem;
    }
    printf("%d", ans);

}

Compilation message (stderr)

boat.cpp: In function 'int main()':
boat.cpp:23:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d", &n);
                     ^
boat.cpp:25:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &A[i], &B[i]);
                                     ^

• Subtask 1: 0 / 9
• Subtask 2: 0 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42