Time bomb

input/code.cpp: In function 'int main()':
input/code.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j=0;j<line.size();j+=4) {
                                  ^

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

ll vals[100000];
string arr[10];

int main()
{
    map<string, int> nums;
    nums["####.##.##.####"] = 0;
    nums["..#..#..#..#..#"] = 1;
    nums["###..#####..###"] = 2;
    nums["###..####..####"] = 3;
    nums["#.##.####..#..#"] = 4;
    nums["####..###..####"] = 5;
    nums["####..####.####"] = 6;
    nums["###..#..#..#..#"] = 7;
    nums["####.#####.####"] = 8;
    nums["####.####..####"] = 9;
    string s;

    int cc = 0;

    for (int i=0;i<5;i++) {
        string line;
        cin >> line;
        int num = 0;
        for (int j=0;j<line.size();j+=4) {
            arr[num] += string(line, j, 3);
            num++;
        }
        cc = num;
    }

    ll sum = 0;

    cc--;
    for (int i=0;i<10;i++) {
        sum += pow(10, cc-i) * nums[arr[i]];
    }

    if (sum % 97 == 0) {
        cout << "BEER!!" << endl;
    } else {
        cout << "BOOM!" << endl;
    }

    /* int n = str[0].length()/6;
    cout << n;
    cout << str[0].length()/(6*4);
    cout << str[0];
    */

    return 0;

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED