Compilare: main.cpp: In function 'void dis_plus_dis(int, int, int, int)': main.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dp[l1][c1].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:26:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == dp[l1][c1].size() - 1) { ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i != dp[n][1].size() - 1) { ~~^~~~~~~~~~~~~~~~~~~~~~