๋ฐฑ์ค 2847๋ฒ
์ฝ๋
const fs = require('fs');
const input = fs.readFileSync('/dev/stdin').toString().trim().split('\n').map(Number);
const N = input.shift();
let result = input.reduce((a, b) => a + b, 0);
for (let i = N - 2; i >= 0; i--) {
if (input[i] >= input[i + 1]) {
input[i] = input[i + 1] - 1;
}
}
console.log(result - input.reduce((a, b) => a + b));
์ด ๊ธ์ ์ ๊ฒ ๋ง์ ๋์์ด ๋์์ต๋๋ค.