func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     string s;     cin >> s;     int n = s.length();     vector<int> P(n, 0);     int C = 0;     int R = 0;     for (int i = 1; i < n - 1; i++) {       int mirror = 2 * C - i;       if (R > i) {         P[i] = min(R - i, P[mirror]);       } else {         P[i] = 0;       }       while ((i + 1 + P[i] < n) && (i - 1 - P[i] >= 0) &&              (s[i + 1 + P[i]] == s[i - 1 - P[i]])) {         P[i]++;       }       if (i + P[i] > R) {         C = i;         R = i + P[i];       }     }     string rev(s);     reverse(rev.begin(), rev.end());     vector<int> T(n, 0);     T[0] = -1;     int pos = 2;     int cnd = 0;     while (pos < n) {       if (rev[pos - 1] == rev[cnd]) {         cnd++;         T[pos] = cnd;         pos++;       } else if (cnd > 0) {         cnd = T[cnd];       } else {         T[pos] = 0;         pos++;       }     }     int m = 0;     int revI = 0;     vector<int> found(n + 1, -1);     found[0] = 0;     while (revI < n && m + revI < n) {       if (rev[revI] == s[m + revI]) {         if (found[revI + 1] == -1) {           found[revI + 1] = m;         }         revI++;       } else {         m = m + revI - T[revI];         if (T[revI] > -1) {           revI = T[revI];         } else {           revI = 0;         }       }     }     vector<int> fend(n + 1, -1);     int fendMax = 0;     for (int i = 0; i <= n; i++) {       if (found[i] != -1) {         fend[i] = found[i] + i;         fendMax = i;       }     }     int best = 0;     int bestMidSt = 0;     int bestMidL = 0;     int bestLeftSt = 0;     int bestSideL = 0;     for (int i = 0; i < n; i++) {       int midStart = i - P[i];       int midEnd = i + P[i];       int lLow = 0;       int lHigh = min(n - midEnd, fendMax + 1);       int lCur = (lLow + lHigh) / 2;       while (lHigh - lLow > 1) {         if (fend[lCur] <= midStart) {           lLow = lCur;         } else {           lHigh = lCur;         }         lCur = (lLow + lHigh) / 2;       }       int curBest = 2 * P[i] + 1 + 2 * lCur;       if (curBest > best) {         best = curBest;         bestMidSt = midStart;         bestMidL = 2 * P[i] + 1;         bestLeftSt = found[lCur];         bestSideL = lCur;       }     }     if (bestSideL == 0) {       cout << 1 << endl;       cout << (bestMidSt + 1) <<     << bestMidL << endl;     } else {       cout << 3 << endl;       cout << (bestLeftSt + 1) <<     << bestSideL << endl;       cout << (bestMidSt + 1) <<     << bestMidL << endl;       cout << (n - bestSideL + 1) <<     << bestSideL << endl;     }     return 0;   }   