Compilare: main.cpp: In function 'int main()': main.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(int i = 1;i < presum.size();i++){ | ~~^~~~~~~~~~~~~~~ main.cpp:44:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | if(n > presum.size()){ | ~~^~~~~~~~~~~~~~~ main.cpp:15:22: warning: unused variable 'ans' [-Wunused-variable] 15 | int n, t1, t2, t3, ans = 0, o1 = 10, o2 = 10, o3 = 10; | ^~~