Submission #65918992

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Source Code Expand

#include <stdio.h>
#include <math.h>

int main(void){
    int N;
    scanf("%d", &N);
    int P[N];
    for(int i = 0; i < N; i++){
        scanf("%d", &P[i]);  
    }
    
    long long kosu = 0;
    int sign[N];
    for (int i = 0; i < N - 1 ; i++){
        if(P[i] < P[i+1]){sign[i+1] = 1;} //+1
        else{sign[i+1] = -1;} //-1
    }

    int fugou_block[N];
    int block_sign[N];
    int block_idx = 0;

    fugou_block[0] = 1;
    block_sign[0] = sign[1];
    int tmp_sign = sign[1];

    for(int i = 2; i < N; i++){
        if(tmp_sign != sign[i]){
            block_idx += 1;
            fugou_block[block_idx] = 1;
            tmp_sign = sign[i];
            block_sign[block_idx] = tmp_sign;
        } else {fugou_block[block_idx] += 1;}
    }


   for(int i = 0; i <= block_idx - 2; i++){
        if (block_sign[i]   ==  1 && block_sign[i+1] == -1 && block_sign[i+2] ==  1)
        {
            kosu += (long long)fugou_block[i] * fugou_block[i+2];
        }
    }
    printf("%lld\n", kosu);
    return 0;
}

Submission Info

Compile Error

Main.c: In function ‘main’:
Main.c:6:5: warning: ignoring return value of ‘scanf’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    6 |     scanf("%d", &N);
      |     ^~~~~~~~~~~~~~~
Main.c:9:9: warning: ignoring return value of ‘scanf’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    9 |         scanf("%d", &P[i]);
      |         ^~~~~~~~~~~~~~~~~~

Judge Result